We found this circuit with SCRs and unijunction in a Radio Electronics magazine from June 1969. The SCRs must be in accordance with the controlled incandescent lamp. The circuit is powered by DC.
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...