Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

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Photosensitive power circuit (CB25193E)
This circuit can be used in alarms by activating a relay or a current load that depends on the...
LM3900 Non-Inverter Comparator (CB14207E)
The circuit given below was found in the National Semiconductor Linear Applications Handbook. The...
Phototransistor Currente Control (3) (CB14641E)
The current of this circuit is determined by a PNP transistor. The circuit is suggested by Texas...