LED VU (CB22157E)

This circuit was found in a 1989 publication. The operational amplifier supports equivalents. The LED range can be expanded.

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555 Linear Ramp Generator (CB6357E)
This circuit appears elsewhere in this section and on this site. The circuit generates a linear...
Receiver monitor (CB8632E)
This circuit was found in a 90s Hands-On Electronics. When a signal appears at the headphone...
Light Activated OR Gate 2 (CB5320E)
This circuit, which may have more inputs, consists of an optical OR gate using common...