Powerful IR Emitter (CB26030E)

This modulated circuit was found in the November 1997 Electronics Now magazine. The power transistor can be any MOSFET,

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Commercial Radio 6TR 127 (CB18355E)
This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...
Car Alarm (CB6773E)
Found in a Popular Electronics from the 90s, this circuit uses components that are still current....
Simple Capacitor Meter (CB19588E)
This circuit consists of a simple capacitance bridge. The handset can be high impedance from 500...