Fast log generator (CB7595E)

We found this circuit in a 90s Popular Electronics. The operational amplifier can be replaced by current equivalents.

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Direction Indicator for Bike (CB931E)
This circuit was found in Electronics Handbook, Vol XIII 1993 and consists of a simple direction...
Megaphone (CB994E)
This circuit works only with carbon microphones, due its low impedance. The speaker should be good or...
Unijunction Oscillator (CB928E)
This is the normal circuit of a relaxation oscillator using an unijunction transistor such as the...