Ambient light indicator (CB21567E)

This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The power supply does not have to be symmetrical.

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10 Hour Timer (CB18957E)
This long-time circuit uses a field effect transistor, which may be the BF245, and depends on a...
AND gate with LM3900 (CB25173E)
The figure shows how to implement the AND function with a Norton LM3900 operational amplifier. The number of...
Pre with RIAA equalization 741 (CB19620E)
This circuit is from an old documentation, but it can be elaborated with ease, since the...