LED beacon (CB21017E)

This circuit was taken from a popular 90's Electronics. The LDR is mounted next to the LED to feed back the circuit.

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Analog switch (CB21253E)
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...
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This circuit is from 1998 documentation. The circuit uses the TDA2002 in a bridged configuration and...
Voltage Indicator (CB19863E)
The circuit shown indicates voltages from 10 to 14 V used to monitor automotive voltage. One or...