{"title":"Transducers","description":"\u003cp\u003eSpeakers, Microphones, Piezos\u003c\/p\u003e","products":[{"product_id":"low-height-radio-speaker-55mm-diameter-8-ohm-0-5w-ferrite-magnet","title":"Low Height Radio Speaker, 55mm Diameter 8 Ohm 0.5W Ferrite Magnet","description":"This is one item of new, paper cone radio speaker. The outer diameter is 55mm, the depth is a remarkably thin 11mm. The coil impedance is 8 Ohm and the power rating is 0.5W. ","brand":"HJW Electronics","offers":[{"title":"Default Title","offer_id":58501258051968,"sku":null,"price":2.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/il_fullxfull.4221465344_3pr9.jpg?v=1785347556"},{"product_id":"radio-speaker-ferrite-magnet-57mm-diameter-8-ohm-0-5-watt","title":"Radio Speaker Ferrite Magnet 57mm Diameter 8 Ohm 0.5 Watt","description":"\u003cp\u003eThis is one item of new, paper cone radio speaker. The outer diameter is 57mm, the depth is 18mm. The coil impedance is 8 Ohm and the power rating is 0.5W.\u003c\/p\u003e\n\u003cp\u003eYou may have seen similar units used fitted into empty pringle tubes stuffed loosely with tissue paper as a simple loudspeaker enclosure as seen in the application example pictures, empty tube and radio not included.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Default Title","offer_id":58501258838400,"sku":null,"price":2.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/top_s_5185aafa-c379-49f0-ad67-bb9001173eac.jpg?v=1788266863"},{"product_id":"electret-condenser-microphone-with-pre-soldered-wires","title":"Electret Condenser Microphone With Pre-Soldered Wires","description":"\u003cp\u003e10mm Diameter Electret Condenser Microphone Element Insert with Connection Wires J60-C\u003c\/p\u003e\n\u003cp\u003eThis is on item of new electret condenser microphone element with 65mm long flying leads soldered on. The higher quantity options are cheaper per item. The wire is reasonably thick 7 X 0.2 type and is relatively easy to handle during installation without breaking it. These require a low noise power supply of between 1.5 and 10V fed via a resistor of approximately 1K Ohms connected to the red wire. The standard voltage for this type is 4.5V. A D.C. blocking capacitor of something like 10uF is then typically used to feed the signal into the microphone pre-amplifier. Some tape recorder microphone inputs may have this power supply and capacitor internally, in which case they will generally state that on the machine. The sensitivity is -64dB +\/-3dB at an operating voltage of 4.5V. The current drain is 0.5mA maximum, S\/N ratio is 40dB or better. The output impedance tends to be dominated by the bias resistor, so in the typical case it will always be less than 1K. A data sheet is shown in the secondary pictures. The diameter is 10mm and the total height including the solder terminals and wires is 8mm.\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"1 Mic","offer_id":58833396138368,"sku":null,"price":2.8,"currency_code":"GBP","in_stock":true},{"title":"2 Mics","offer_id":58833396171136,"sku":null,"price":5.2,"currency_code":"GBP","in_stock":true},{"title":"3 Mics","offer_id":58833396203904,"sku":null,"price":7.4,"currency_code":"GBP","in_stock":true},{"title":"4 Mics","offer_id":58833396236672,"sku":null,"price":9.3,"currency_code":"GBP","in_stock":true},{"title":"5 Mics","offer_id":58833396269440,"sku":null,"price":10.9,"currency_code":"GBP","in_stock":true},{"title":"10 Mics","offer_id":58833396302208,"sku":null,"price":19.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/j60_wires_top_s.jpg?v=1788287747"},{"product_id":"4-watt-8-ohm-elliptical-loudspeaker-6-x-4-155mm-x-105mm-replacement-oval-radio-speaker-8r-4w","title":"4 Watt 8 Ohm Elliptical Loudspeaker, 6 X 4 155mm x 105mm Replacement Oval Radio Speaker 8R 4W","description":"\u003cp\u003eThis is one item of new, paper coned replacement speaker that you might find in a basic transistor radio or need for a project. They have good sized, fairly weighty magnets. I prefer the sound of elliptical speakers in a less than hi-fi situation due to the reduced level of strong, 'cheap radio' sounding resonances. The headline specs are listed below.\u003c\/p\u003e\n\u003cp\u003eFixing Centres Lengthways: 94, 105, 128, 144 mm by...\u003cbr\u003eFixing Centres across shorter side: 94, 91, 74, 62 mm in the same order as above\u003cbr\u003eDepth: 40 mm\u003cbr\u003eLength: 155 mm\u003cbr\u003eWidth: 105 mm\u003cbr\u003eweight: 0.316 Kg\u003cbr\u003eFrequency Response: 135-10000 Hz\u003cbr\u003eImpedance: 8 Ohms\u003cbr\u003ePower RMS: 4 Watt\u003cbr\u003eResonant Frequency: 140 Hz\u003cbr\u003eSensitivity: 95 dBV\/Pa\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"Default Title","offer_id":58501261623680,"sku":"OVAL BIG","price":11.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/files\/top_s_57f6bb16-47e1-4e1e-bd5d-ec19960e7944.jpg?v=1788108679"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2136\/1280\/collections\/hjw_elec_1791_1791_5115368c-ff89-4df4-8a72-4388247b55a8.jpg?v=1787758153","url":"https:\/\/shop.usefulcomponents.com\/collections\/transducers.oembed","provider":"HJW Electronics","version":"1.0","type":"link"}