Timed Alarm (CB6423E)

We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is not pressed to reset.

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Telegraphy Practice Oscillator (CB4200E)
This is one of many Morse code audio oscillators that can be found in this section. The circuit...
Common Telephone Line Simulator (CB6873E)
This simple circuit can be used to power a simple communication system using ordinary telephones....
Microsemi Le87557 Differential Amplifier
Microsemi Le87557 Differential Amplifier Mouser Electronics offers Microsemi Le87557 single...