Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Divider by N + ½ (CB6533E)
This interesting 80's EDN circuit divides the input pulse frequency by a number given by n...
Adafruit Raspberry Pi Perma Proto PCB Kits
Adafruit Raspberry Pi Perma Proto PCB Kits Adafruit kits are available from Mouser Electronics...
FSK receiver (CB14568E)
This circuit is from the Motorola Linear Databook of 1990. The coils must be according to the...