Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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Adjustable hysteresis (CB21515E)
This circuit was suggested by a 1967 Electronic Design. Modern equivalent transistors can be used....
Solar Cell Switched Regulator (CB1187E)
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...
Bookstore – Books in English
The author has many books he had written in Eglish (See the Biography) published by famous...