{"title":"Opto","description":"\u003cp\u003eA selection of optoelectronic devices including LEDs, LDRs, photodiodes, lenses, and bulbs.\u003c\/p\u003e","products":[{"product_id":"pre-wired-led-5v-to-6-volt-3mm-diameter-clear-high-brightness-constant-leds","title":"Pre-Wired LED 5V To 6 Volt 3mm Diameter Clear High Brightness Constant LEDs","description":"\u003cp\u003eThis is a pack of 1, 5, or 10 items of 3mm diameter LED with 20cm wire leads with a resistor for five to six Volt operation fitted into the leads. Nominal current at 6V is 20mA. The lit pictures are taken using a 6V battery pack comprising four AA cells. One LED will run for about 130 hours on Duracell or similar good quality AA alkaline cells. Ten LEDs will run for more than ten hours on such a battery pack. The violet type will show up day-glo fluorescent items and markers but not special banknote inks. Slightly larger 5mm types are available on another listing in my shop.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe yellow colour is not quite as bright as the others due to a peculiarity of the physics involved in the silicon LED process.\u003cbr\u003e\u003cbr\u003eThe batteries and pack shown for demonstration purposes in the video are not included.\u003cbr\u003e\u003cbr\u003eIf using a power supply it needs to be a regulated type. Nominally 6V train set transformers and old battery chargers providing rectified a.c. at a peak voltage higher than 7V will kill the LEDs. Operation from the 5V rail of computer PSUs or 5V USB VBus is good, and for one LED a 20mA 5V logic output equally so. The colours available are red, orange, yellow, green, blue, violet, pink, warm white, and white.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Red \/ 1 LED","offer_id":58742055338368,"sku":"LED 3MM 6V CONST RED Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 5 LEDs","offer_id":58742055371136,"sku":"LED 3MM 6V CONST RED Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 10 LEDs","offer_id":58742055403904,"sku":"LED 3MM 6V CONST RED Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 1 LED","offer_id":58742055436672,"sku":"LED 3MM 6V CONST ORANGE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 5 LEDs","offer_id":58742055469440,"sku":"LED 3MM 6V CONST ORANGE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 10 LEDs","offer_id":58742055502208,"sku":"LED 3MM 6V CONST ORANGE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 1 LED","offer_id":58742055534976,"sku":"LED 3MM 6V CONST YELLOW Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 5 LEDs","offer_id":58742055567744,"sku":"LED 3MM 6V CONST YELLOW Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 10 LEDs","offer_id":58742055600512,"sku":"LED 3MM 6V CONST YELLOW Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 1 LED","offer_id":58742055633280,"sku":"LED 3MM 6V CONST GREEN Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 5 LEDs","offer_id":58742055666048,"sku":"LED 3MM 6V CONST GREEN Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 10 LEDs","offer_id":58742055698816,"sku":"LED 3MM 6V CONST GREEN Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 1 LED","offer_id":58742055731584,"sku":"LED 3MM 6V CONST BLUE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 5 LEDs","offer_id":58742055764352,"sku":"LED 3MM 6V CONST BLUE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 10 LEDs","offer_id":58742055797120,"sku":"LED 3MM 6V CONST BLUE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 1 LED","offer_id":58742055829888,"sku":"LED 3MM 6V CONST VIOLET Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 5 LEDs","offer_id":58742055862656,"sku":"LED 3MM 6V CONST VIOLET Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 10 LEDs","offer_id":58742055895424,"sku":"LED 3MM 6V CONST VIOLET Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 1 LED","offer_id":58742055928192,"sku":"LED 3MM 6V CONST PINK Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 5 LEDs","offer_id":58742055960960,"sku":"LED 3MM 6V CONST PINK Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 10 LEDs","offer_id":58742055993728,"sku":"LED 3MM 6V CONST PINK Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 1 LED","offer_id":58742056026496,"sku":"LED 3MM 6V CONST WARM Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 5 LEDs","offer_id":58742056059264,"sku":"LED 3MM 6V CONST WARM Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 10 LEDs","offer_id":58742056092032,"sku":"LED 3MM 6V CONST WARM Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 1 LED","offer_id":58742056124800,"sku":"LED 3MM 6V CONST WHITE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 5 LEDs","offer_id":58742056157568,"sku":"LED 3MM 6V CONST WHITE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 10 LEDs","offer_id":58742056190336,"sku":"LED 3MM 6V CONST WHITE Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/3mm_6v_legend_s.jpg?v=1787246956"},{"product_id":"flashing-pre-wired-led-3mm-12v-volt-clear-high-brightness","title":"Flashing Pre-Wired LED 3mm 12V Volt Clear High Brightness","description":"\u003cp\u003eThis is a pack of 1, 5, or 10 items of 3mm diameter flashing LED with 20cm wire leads with a resistor for 12 Volt operation fitted into the leads. Nominal current at 12V is 20mA when lit, and this averages out at 10mA due to the 50:50 flashing duty cycle. The lit pictures are taken using a 12V battery pack comprising eight AA cells. One LED will run for about 260 hours on Duracell or similar good quality AA alkaline cells. Ten LEDs will run for more than forty hours on such a battery pack. The flashing rate is between once and twice per second. When used in a group the flashing is not synchronized.\u003cbr\u003e\u003cbr\u003eOperation down at 6V is still possible on all colors with reduced brightness and approximately 50% current consumption.\u003cbr\u003e\u003cbr\u003eThe yellow color is not quite as bright as the others due to a peculiarity of the physics involved in the silicon LED process.\u003cbr\u003e\u003cbr\u003eThe batteries and pack shown for demonstration purposes in the video are not included.\u003cbr\u003e\u003cbr\u003eIf using a power supply it needs to be a regulated type. Nominally 12V train set transformers and old battery chargers providing rectified A.C. at a peak voltage higher than 12V will kill the LEDs.\u003c\/p\u003e\n\u003cp\u003eThe available colours are red, orange, yellow, green, blue, and white.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Red \/ 1 LED","offer_id":58734495400320,"sku":"3MM FLASH RED Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 5 LEDs","offer_id":58734495433088,"sku":"3MM FLASH RED Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 10 LEDs","offer_id":58734495465856,"sku":"3MM FLASH RED Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 1 LED","offer_id":58734495498624,"sku":"3MM FLASH ORANGE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 5 LEDs","offer_id":58734495531392,"sku":"3MM FLASH ORANGE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 10 LEDs","offer_id":58734495564160,"sku":"3MM FLASH ORANGE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 1 LED","offer_id":58734495596928,"sku":"3MM FLASH YELLOW Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 5 LEDs","offer_id":58734495629696,"sku":"3MM FLASH YELLOW Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 10 LEDs","offer_id":58734495662464,"sku":"3MM FLASH YELLOW Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 1 LED","offer_id":58734495695232,"sku":"3MM FLASH GREEN Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 5 LEDs","offer_id":58734495728000,"sku":"3MM FLASH GREEN Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 10 LEDs","offer_id":58734495760768,"sku":"3MM FLASH GREEN Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 1 LED","offer_id":58734495793536,"sku":"3MM FLASH BLUE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 5 LEDs","offer_id":58734495826304,"sku":"3MM FLASH BLUE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 10 LEDs","offer_id":58734495859072,"sku":"3MM FLASH BLUE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 1 LED","offer_id":58734495891840,"sku":"3MM FLASH WHITE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 5 LEDs","offer_id":58734495924608,"sku":"3MM FLASH WHITE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 10 LEDs","offer_id":58734495957376,"sku":"3MM FLASH WHITE Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/led_3mm_flash_multi_s.jpg?v=1787144401"},{"product_id":"large-fresnel-magnifying-lens-plastic-magnifier-260-x-177mm-solar-firelighter","title":"Large Fresnel Magnifying Lens Plastic Magnifier 260 X 177mm Solar Firelighter","description":"This is one item of a 260 X 177mm (approximately 7 X 10.25 inch) rectangular plastic fresnel lens. It is slightly smaller than A4 paper. The focal length is approximately 30cm. The magnification is a theoretical 3X based on the focal length. The material is optical PVC. You can use these as a traditional magnifier but they have a variety of fun uses such as concentrating sunlight onto small photovoltaic solar cell batteries and setting fire to things like scout camp-fires in sunshine. The thickness measures 0.53mm. The material can be cut with strong scissors or a knife.\u003cbr\u003e\u003cbr\u003eIt's worth mentioning that these are not suitable for use as reversing or side-vision lenses on cars or trucks. You need a diverging lens for that, and they are usually specially made so that they also change the angle of vision off-centre.\u003cbr\u003e\u003cbr\u003eIt is best to keep them out of the sun when not in use. I have the credit card sized items on another listing in my etsy shop.\u003cbr\u003e\u003cbr\u003eI've used these mounted in a frame to project tight beams from infra-red or visible LEDs for light based experimental free space voice or RF link transmission systems, using another similar lens and a photodiode at the receiver end. With a keyswitch on the LED you could use it for morse-code signalling over a substantial distance like an Aldis lamp.","brand":"HJW Electronics","offers":[{"title":"Default Title","offer_id":58501258707328,"sku":"FRESNEL SUB A4","price":3.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/angle_s_a96fe68c-e9ca-421e-bdb1-edd08abaf807.jpg?v=1787495488"},{"product_id":"light-dependant-resistors-ldr-photoresistor-cds-cells-light-detector-sensor","title":"Light Dependant Resistors LDR Photoresistor CdS Cell, Light Detector Sensor","description":"\u003cp\u003eThis is a pack of 1, 5, or 10 items of miniature LDR which can replace the old Mullard ORP12 in most situations. This is smaller, just 5mm diameter which makes it ideal for combining with a 5mm LED to form a fully isolated, wide range variable resistance with low voltage offset. If you really want an analogue audio compressor or fader system to have very low distortion and very low control voltage feedthrough, this can be one way to make the variable gain core, using two devices and a linearising op-amp feedback circuit if necessary. The whole unit is coated in transparent epoxy.\u003cbr\u003e\u003cbr\u003eSpecifications: \u003cbr\u003e\u003cbr\u003eDark resistance: 1M Ohm (typ)\u003cbr\u003eMax Voltage: 150V d.c.\u003cbr\u003eMax Power: 100mW\u003cbr\u003ePeak Spectral Response: 540nm\u003cbr\u003eresistance @ 10 lux: 10-20k Ohm (typ)\u003cbr\u003eresistance @ 100 lux: 2-4k Ohm (typ)\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"1 LDR","offer_id":58734845165952,"sku":"LDR CHEAP Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"5 LDRs","offer_id":58734845198720,"sku":"LDR CHEAP Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"10 LDRs","offer_id":58734845231488,"sku":"LDR CHEAP Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/ldr_front_s_10385ca8-041c-45df-af52-51116094319e.jpg?v=1787151923"},{"product_id":"miniature-neon-bulb-6mm-diameter-mains-indicator-cold-cathode-glow-lamps","title":"Miniature Neon Bulb 6mm Diameter Mains Indicator Cold Cathode Glow Lamp","description":"\u003cp\u003eThis is a pack of standard neon indicator bulb such as you find in mains power plug-tops and trailing sockets. The maximum length of the glass is 13mm and the diameter is 6.5mm.\u003c\/p\u003e\n\u003cp\u003eIn the second picture showing the lit item, it is running on 253 Vac mains via a 680K 0.5W resistor. For 110V mains use a 150K resistor. The stated lifetime is 25,000 hours under these operating conditions. When fitting a replacement, note that the resistor will often be hidden under the insualtion in one of the wire leads.\u003c\/p\u003e\n\u003cp\u003eTechnical Measurements on one sample:\u003c\/p\u003e\n\u003cp\u003eIn the main picture driven from 253 Vac mains with a 680k Ohm resistor in series the measured A.C. voltage across the bulb was:\u003c\/p\u003e\n\u003cp\u003eStandard 57 Vac (0.29mA)\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"1 Bulb","offer_id":58754602697088,"sku":"LUMEX 6MM Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"5 Bulbs","offer_id":58754602729856,"sku":"LUMEX 6MM Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"10 Bulbs","offer_id":58754602762624,"sku":"LUMEX 6MM Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/neon_6mm_test_light_s.jpg?v=1787415845"},{"product_id":"3mm-diffused-led-12-volt-12v-pre-wired-constant","title":"3mm Diffused LED 12 Volt 12V Pre-Wired Constant","description":"\u003cp\u003eThis is one item of diffused lens 3mm diameter 12V pre-wired LED. These types have a wide viewing angle and are more suitable for use as indicators and for some decorative uses than the clear types. The resistor is fitted into the wiring. You can select any of the available colours using the variation drop-downs and get the cheaper prices per unit by selecting the five and ten pack quantities.\u003cbr\u003e\u003cbr\u003eOne LED runs at about 20mA on 12V and all will operate well down to 5V running at 4.5mA with somewhat reduced brightness. They are quite bright, so the 5V or 6V operation is easily good enough for an indicator. Operation from a small 9V battery is good at around 15mA. A 9V 550mAh Duracell Procell MN1604 (PP3) will drive one constant LED for about 36 hours. A 6V battery pack of four Duracell 'Ultra Power' MN1500(AA) will drive one LED for about 500 hours.\u003cbr\u003e\u003cbr\u003eOperation from a regulated 12V D.C. power supply is fine, but beware of train set transformers or battery chargers which provide AC or rectified AC output at a substantially higher peak voltage than the stated nominal. The LEDs will fail immediately on such supplies.\u003cbr\u003e\u003cbr\u003eWhere the pictures show the LEDs operating, the battery and clips are not included.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Red \/ 1 LED","offer_id":58740829553024,"sku":"LED 3MM RED DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 5 LEDs","offer_id":58740829585792,"sku":"LED 3MM RED DIF Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 10 LEDs","offer_id":58740829618560,"sku":"LED 3MM RED DIF Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 1 LED","offer_id":58740829651328,"sku":"LED 3MM ORANGE DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 5 LEDs","offer_id":58740829684096,"sku":"LED 3MM ORANGE DIF Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 10 LEDs","offer_id":58740829716864,"sku":"LED 3MM ORANGE DIF Q10","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 1 LED","offer_id":58740829749632,"sku":"LED 3MM YELLOW DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 5 LEDs","offer_id":58740829782400,"sku":"LED 3MM YELLOW DIF Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 10 LEDs","offer_id":58740829815168,"sku":"LED 3MM YELLOW DIF Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 1 LED","offer_id":58740829847936,"sku":"LED 3MM GREEN DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 5 LEDs","offer_id":58740829880704,"sku":"LED 3MM GREEN DIF Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 10 LEDs","offer_id":58740829913472,"sku":"LED 3MM GREEN DIF Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 1 LED","offer_id":58740829946240,"sku":"LED 3MM BLUE DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 5 LEDs","offer_id":58740829979008,"sku":"LED 3MM DIF BLUE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 10 LEDs","offer_id":58740830011776,"sku":"LED 3MM BLUE DIF Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 1 LED","offer_id":58740830044544,"sku":"LED 3MM WHITE DIF Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 5 LEDs","offer_id":58740830077312,"sku":"LED 3MM WHITE DIF Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 10 LEDs","offer_id":58740830110080,"sku":"LED 3MM WHITE DIF Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/group_close_s.jpg?v=1787232398"},{"product_id":"12v-3mm-led-6v-to-12-volt-pre-wired-clear-high-brightness-constant","title":"12V 3mm LED 6V to 12 Volt Pre Wired Clear High Brightness, Constant","description":"\u003cp\u003eThis is a pack of 1, 5, or 10 items of 3mm diameter LED with 20cm wire leads with a resistor for 12 Volt D.C. operation fitted into the leads. Nominal current at 12V is 20mA. The lit pictures are taken using a 12V battery pack comprising eight AA cells. One LED will run for about 130 hours on Duracell or similar good quality AA alkaline cells. Ten LEDs will run for more than ten hours on such a battery pack. The violet type will show up day-glo fluorescent items and markers but not special banknote inks. Operation down to 6V is possible where the brightness is somewhat reduced but battery life is extended.\u003cbr\u003e\u003cbr\u003eThe yellow colour is not quite as bright as the others due to a peculiarity of the physics involved in the silicon LED process.\u003cbr\u003e\u003cbr\u003eI have 5mm and 10mm, constant and flashing types on other listings.\u003cbr\u003e\u003cbr\u003eThe batteries and pack shown for demonstration purposes in the video are not included.\u003cbr\u003e\u003cbr\u003eIf using a power supply it needs to be a regulated type. Nominally 12V train set transformers and old battery chargers providing rectified a.c. at a peak voltage higher than 12V will kill the LEDs.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Red \/ 1 LED","offer_id":58746928529792,"sku":"LED 3MM 12V CONST RED Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 5 LEDs","offer_id":58746928562560,"sku":"LED 3MM 12V CONST RED Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 10 LEDs","offer_id":58746928595328,"sku":"LED 3MM 12V CONST RED Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 1 LED","offer_id":58746928628096,"sku":"LED 3MM 12V CONST ORANGE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 5 LEDs","offer_id":58746928660864,"sku":"LED 3MM 12V CONST ORANGE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Orange \/ 10 LEDs","offer_id":58746928693632,"sku":"LED 3MM 12V CONST ORANGE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 1 LED","offer_id":58746928726400,"sku":"LED 3MM 12V CONST YELLOW Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 5 LEDs","offer_id":58746928759168,"sku":"LED 3MM 12V CONST YELLOW Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Yellow \/ 10 LEDs","offer_id":58746928791936,"sku":"LED 3MM 12V CONST YELLOW Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 1 LED","offer_id":58746928824704,"sku":"LED 3MM 12V CONST GREEN Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 5 LEDs","offer_id":58746928857472,"sku":"LED 3MM 12V CONST GREEN Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Green \/ 10 LEDs","offer_id":58746928890240,"sku":"LED 3MM 12V CONST GREEN Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 1 LED","offer_id":58746928923008,"sku":"LED 3MM 12V CONST BLUE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 5 LEDs","offer_id":58746928955776,"sku":"LED 3MM 12V CONST BLUE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 10 LEDs","offer_id":58746928988544,"sku":"LED 3MM 12V CONST BLUE Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 1 LED","offer_id":58746929021312,"sku":"LED 3MM 12V CONST VIOLET Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 5 LEDs","offer_id":58746929054080,"sku":"LED 3MM 12V CONST VIOLET Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Violet \/ 10 LEDs","offer_id":58746929086848,"sku":"LED 3MM 12V CONST VIOLET Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 1 LED","offer_id":58746929119616,"sku":"LED 3MM 12V CONST PINK Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 5 LEDs","offer_id":58746929152384,"sku":"LED 3MM 12V CONST PINK Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Pink \/ 10 LEDs","offer_id":58746929185152,"sku":"LED 3MM 12V CONST PINK Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 1 LED","offer_id":58746929217920,"sku":"LED 3MM 12V CONST WARM Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 5 LEDs","offer_id":58746929250688,"sku":"LED 3MM 12V CONST WARM Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"Warm White \/ 10 LEDs","offer_id":58746929283456,"sku":"LED 3MM 12V CONST WARM Q10","price":7.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 1 LED","offer_id":58746929316224,"sku":"LED 3MM 12V CONST WHITE Q1","price":1.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 5 LEDs","offer_id":58746929348992,"sku":"LED 3MM 12V CONST WHITE Q5","price":4.9,"currency_code":"GBP","in_stock":true},{"title":"White \/ 10 LEDs","offer_id":58746929381760,"sku":"LED 3MM 12V CONST WHITE Q10","price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/3mm_12v_const_group_s.jpg?v=1787306117"},{"product_id":"credit-card-sized-flat-plastic-magnifier-fresnel-magnifying-lens-solar-firelighter","title":"Credit Card Sized Flat Plastic Magnifier Fresnel Magnifying Lens, Solar Firelighter","description":"\u003cp\u003eThis is one item of new fresnel magnifier available in packs of 1, 5, or 10. The material is optical PVC. The plastic is 52 X 83mm and the magnifying area is 42 X 77mm. The thickness measures about 0.47mm. The focal length is about 18cm. You can just about use this to light fires on black paper in bright sunlight but it takes a bit of patience. Of course you can use this as a pocket magnifier, or more interestingly I've used these to project tight beams from infra-red or visible LEDs for light based experimental free space voice or RF link transmission systems, using another similar lens and a photodiode at the receiver end.\u003c\/p\u003e\n\u003cp\u003eIn one of the pictures a spot of light is projected onto my wall some 3 metres distant from a simple 5mm bright green LED running at about 18mA. Looking at this from the far end, the single LED and lens combination is impressively bright, like a railway signal. With a keyswitch on the LED you could use it for morse-code signalling over a substantial distance like an Aldis lamp.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"1 Lens","offer_id":58759461929344,"sku":null,"price":1.9,"currency_code":"GBP","in_stock":true},{"title":"5 Lenses","offer_id":58759461962112,"sku":null,"price":4.9,"currency_code":"GBP","in_stock":true},{"title":"10 Lenses","offer_id":58759461994880,"sku":null,"price":7.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/cc_top_s.jpg?v=1787504984"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/collections\/opto_11.jpg?v=1787146149","url":"https:\/\/shop.usefulcomponents.com\/collections\/opto.oembed","provider":"HJW Electronics","version":"1.0","type":"link"}