Simple FM transmitter (CB8728E)

Found in 90s Radio Electronics, this small transmitter has a good range. L1 is formed by 3 + 3 turns of wire 24 around a pencil as a reference.

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Up to 60 V x 5 A power supply using the 741 II (CB1218E)
This circuit was obtained in an 1975 English publication. It is a voltage regulator circuit for...
Infrared receiver (CB7822E)
In the figure we have an infrared receiver circuit using an operational 741. The circuit is an...
Negative Voltage Regulator (CB15903E)
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...