This is an improved circuit from the earlier version also found in the April 1972 Radio Electronics magazine. The power transistors must be provided with heat sinks.
The transistors T1 and T2 of this circuit can be the BC558. T3 can be a BD135 and T4 a TIP42. The...
In the figure we show a means of changing the output voltage of a fixed regulator, such as 7805 or...
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...