Power supply for automotive projects (CB21187E)

This 1 A power supply was found in an Electronics Now from the 90's. The integrated circuits must be equipped with heat sinks.

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Low battery indicator (CB9552E)
This circuit was found in a 90s American documentation from the 90s. The components are from that...
Clamp AC Microammeter (CB23563E)
In the figure we have the circuit of a clamp-type microammeter described in the Radio Electronics...
Gain 10 Amplifier – 741 (CB254E)
The voltage-gain for this amplifier is 10. Other operational amplifiers can be use and the Power...