Subsonic Filter (CB25143E)

We found this circuit in the June 1988 Radio Electronics magazine. The power supply must be symmetrical.

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Triac Shield (CB4591E)
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2.7 V Power Supply (CB8687E)
This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967...
Two Transistor Relay Driver (CB11197E)
With this circuit it is possible to control a relay up to 100 mA with an extremely low input...