DC to DC converter (CB9671E)

This small low current inverter operates at 20 kHz frequency. We found it in documentation from the 1980s. The integrated circuit is from that time.

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Digital Die (CB17098E)
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This circuit is from 1980 documentation. We can exchange the BC177 for a BC557 and the TIP41 must...
Single Voltage Reducer (CB16872E)
From different input voltages V, it is possible to reduce the voltage to several fixed values...