HJW Electronics Choccy Block Terminal Strip AM MW Radio Kit CBRK-1

This is a kit of electronic parts which will allow you to build a MW AM transistor radio using modern parts as detailed on the Useful Components website:

https://www.usefulcomponents.com/main_contents/projects/choccy_block_trf_radio/choccy_block_trf_radio.html

Electronic Parts Included in the Kit

Qty Refs Type Value

1 VC1 variable capacitor 200PF approx
1 L1 ferrite rod d=9.5mm l=100mm see text

2 R1,R3 resistor 1K
1 R11 resistor 470R
1 R12 resistor 1.8K
3 R2,R4,R8 resistor 6.8K
1 R7 resistor 12K
1 R9 resistor 27K
3 R5,R14,R15 resistor 47K
1 R10 resistor 100K
1 R6 resistor 330K
2 R13, R16 resistor 220R

1 VR1, SW1 switched log pot A10K
1 C9 ceramic capacitor 68pF
5 C1,C2,C3,C4,C5 ceramic capacitor 10NF
1 C6 ceramic capacitor 100NF
1 C7 electrolytic capacitor 10UF
1 C8 NP elec capacitor 4.7UF
3 C10,C11,C12 electrolytic capacitor 100UF

2 D1,D2 diode 1N4148

1 Q4 NPN audio transistor BC549C
1 Q3 PNP audio transistor BC560C
1 Q5 NPN driver transistor BD139
1 Q6 PNP driver transistor BD140
2 Q1,Q2 NPN RF transistor BF199

Miscellaneous

1 SP1 65mm 8R loudspeaker
1 J1 PP3 battery clip
3 3A 12-way terminal strip
2 3A 1-way terminal strip
6 M2.5 bolts 20mm
2 M2.5 bolts 4mm
8 M2.5 washers
6 M2.5 nuts
2 short shaft control knobs
1 orange single core wire 3m
1 yellow single core wire 0.1m
1 red single core wire 0.2m
1 black single core wire 0.2m
1 cardboard box enclosure

Extras Not Supplied

Paper glue
Paper
Small screwdriver
Scissors
Sticky tape
Small wire cutters
Craft Knife
PP3 9V Battery

All the build information is provided online so that easy updates can be added. Please refresh the page using the F5 key before starting out, just in case an update has been made. There is no paper documentation supplied.

All the build information is provided online so that easy updates can be added. Please refresh the page using the F5 key before starting out, just in case an update has been made. There is no paper documentation supplied.

People have had plenty of success with this tried and tested design. If you put the parts in the right places and build as described, you'll have an instant school science project. There are some additional experiments described on the web-page for that bit of extra credit.

A quicker to build and somewhat more economical plug-in breadboard version that uses the same circuit is available on another listing.