Differential Output Amplifier (CB6135E)

This circuit of old American documentation (1965) can be applied to any transistor.

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Zero Crossing Switch (CB13902E)
This circuit is indicated for the control of resistive loads. When S1 is opened, the triac turns on...
Simple Ohmmeter (CB11932E)
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...
100 Hz High Pass Filter (CB12575E)
The filter shown in the figure is suggested by National Semiconductor having a cutoff frequency of 100Hz...