Second Order Voice Filter (CB6544E)

Found on an 80's Radio Electronics, this circuit is designed to pass the 300 to 34,000 Hz voice range using standard operational amplifiers.

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Ultrasonic emitter (CB9383E)
Found in Radio Electronics from the 90s, this circuit has a power given by the output amplifier. The...
Darlington FET and Bipolar (CB13417E)
This circuit is from an American documentation from 1976. The FET can be the BF245 or MPF102 and...
Signal generator with the 555 IC (CB7800E)
This common configuration is one of many that can be found in this section using the 555. The...