Triangular and square signal generator (CB21448E)

This circuit was taken from an old American documentation. It can be built with modern op amps. The power supply does not have to be symmetrical.

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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...