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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6 500 Gain Amplifier (CB6642E)
Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76...
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This circuit was found in a European technical documentation from 1991. It is a circuit that must...
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This harmonic oscillator controlled by crystal was found in an American documentation of the 90's....