TTL insulated shield (CB8073E)

This circuit was obtained in a Popular Electronics of the 90s. The circuit is compatible with microcontrollers being powered by 5 V.

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FM Generator (CB6996E)
We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The...
Dynamic Microphone Preamplifier (CB4730E
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100 kHz Calibrator (CB3923E)
This simple calibration circuit consists of a crystal oscillator that generates an accurate 100 kHz...