Modulator Amplifier (V1574E)

This circuit is from a 1938 tube manual. Transformers are the critical components. Component values are given.

FETs Integrator (CB19375E)
This integrator circuit uses the junction FETs which can also be the BF245 or MPF102. The...
IR Receiver (CB875E)
This circuit can be used in alarms, data links or áudio links using IR radiation. The circuit is...
Mark and Space CMOS Oscillator (CB19233E)
This oscillator can use inverters or connected AND or NAND gates as such. The signal produced with...