This 1968 Mallory circuit uses an uncommon integrated circuit today. The circuit has a 30 to 20,000 Hz response with lower power and is powered by 12 V.
Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors...
This circuit was found in an Electronics World of 1968. The transistor can be any general purpose and...
This power source was found in a 1968 Electronics World. The transistors are from that time. The...