This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...
Found in a Philips publication from the 1970s, this circuit uses a DO040, which is difficult to obtain...
This simple nicad battery charger uses a current regulator with the LM350. This integrated circuit must be...