This stabilized source can supply currents up to 700 mA and the output voltage is close to 15 V. a little less with the load. The power transistor must have a good heat radiator.
This simple indicator is for 12 batteries, just adjust the trigger point in the trimpot. The...
This circuit was found in an American 1980s documentation. The circuit can be digitally programmed...
This small tone generator was found in the November 1987 issue of Radio Electronics magazine. The...