3-decade logarithmic AD (CB9024E)

This circuit was found in a 70s American documentation. The converter can be of any type and the power supply for the operators must be symmetrical.

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Undervoltage Detector (CB6524E)
Found in a 1980s documentation, this circuit detects when the voltage drops below 11 V. Other...
Magnetic Head Preamplifier (CB18898E)
This is a commercial circuit from a Japanese publication from 1972. The circuit uses a FET that...
FM modulator with 555 (CB12102E)
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...