60 Hz Time Base (CB18274E)

The circuit shown in the figure is from a time base that generates 60 Hz rectangular signals.

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Operational AC Amplifier (CB19474E)
In the figure we have the way to use a common operational amplifier for AC signals. The resistor...
Negative Resistance Circuit (CB926E)
This configuration presents a negative resistance caracteristic such as the one found in...
Car Alarm (CB14448E)
The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x...