This circuit protects galvanometers that are excited by low impedance amplifiers. The circuit is from na old Electronic Design. The components are from the era.
This circuit sensor is an NTC with a resistance of the order of 2k. The SCR can be from the TIC...
The load current can be adjusted up to about 1 A. The transistor can be TIP32 or TIP42. The...
This oscillator with common general-purpose transistors appeared in Radio Electronics magazine in...