60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

0 to 100 mV Stabilized (CB15848E)
This interesting source of very low voltage for reference finds applications in the...
Vox (CB22073E)
This sonic switch, sound relay or simply vox uses a medium impedance speaker as a microphone. The...
4 voltage reference using LEDs (CB22135E)
Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage...