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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High Speed Photo Amplifier (CB881E)
This circuit was found in the Optoelctronics Sourcebook from Texas Instruments. The circuit has a...
Speaker as Microphone (CB1398E)
With this preamplifier it is possible to use a small speaker as a microphone. The circuit is also...
2 MHz XTAL Oscillator (CB440E)
This circuit can be used as a clok in digital applications. Power supply is 5-V and the pins for...