RIAA Line Drive Amplifier (CB8932E)

Found in 90s documentation from Analog Devices, this circuit employs operational amplifiers of the time. The power supply must be symmetrical.

Audio Generator 4093 (CB6887E)
The circuit, shown in the figure, consists of an audio oscillator that generates signals between...
Spy transmitter detector (CB7546E)
This circuit was found in a 1992 PE Hobbyst. The circuit detects the presence of spy...
LED Flasher Using in Unijunction Transistor (CB531E)
This circuit produces low power flashes in a LED. Frequency is adjusted by P1 and depends also on...