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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Binary Counter (CB6139E)
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...
Multimedia PWM Amplifier (CB17971E)
This circuit provides a power of the order of 2 W, characterized by high performance. The output...
Water Detector (CB231)
The sensor can be made using two bare wire or two screen with a piece of tisse between them. One...