This configuration can be applied to other operational amplifiers to increase the current capacity. The circuit is from the 80s. The transistors used are from that time.
Similar circuits can be found on this site. This is from an 80's American documentation. The...
To operate with high input voltages using a 3-terminal voltage regulator such as the LM340-15, we...
This simple multimeter takes advantage of the low cost common galvanometer of 200 uA or 1 mA and...