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 generates a pulse of duration determined by the capacitor when an object interrupts the...
This inverter circuit was found in a Radio Electronics. It shows the basic configuration of a...
This was a very popular instrument in the workshops of the 60s and 70s. It was a "top of the line"...