The power supply for this 1972 circuit must be symmetrical and the BC549 transistors. Care with the layout is important to avoid capturing tinnitus.
Combined with the two previous circuits, we can create a simple multimeter with this circuit. The...
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...
This alarm with automatic shutoff was found in the April 1975 Radio Electronics magazine. The...