Low frequency multiplier (CB8239E)

This circuit was found in a 90s Electronic Design. The integrated circuits are from that time. Frequency multiplication can be done for odd integers.

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Stabilized 2,000 Gain Amplifier (CB6643E)
This circuit was found in a 1960s documentation, providing a 2,000 gain amplified output. | Clique na...
1 to 15 MHz Crystal Oscillator (CB882E)
Frequency in this oscillator is controlled by a crystal. Any 1 MHz to 15 MHz can be used. The JFET can...
4.1 V x 35 mA Power Supply (CB13206E)
This small source is suitable for low consumption equipment that uses batteries. The circuit is...