The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This circuit was obtained from an Elektor magazine from the 90s. The circuit is to protect...
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...