30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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50 to 150 MHz oscillator (CB9629E)
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...
Ultrasound Emitter (MSB122E)
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....
Audio IR Link (CIR811E)
This circuit is used to convert audio signals from na amplifier into infrared modulated signals....