FM Booster (CB22014E)

Found in old English documentation this circuit can be made with a BF245 or equivalent. Coils are according to FM band or other.

Alarm for parallel sensors (CB6416E)
This circuit was obtained from a Popular Electronics of the 90s. The SCR is of any type and the...
4 to 55 MHz amplifier (CB9166E)
This broadband amplifier was found in an Elektor from the 90's. The gain is 10 dB with a noise...
IR Sensor with 741 (CB25575E)
This circuit can be used to obtain control signals from an infrared emitting source. The circuit is...