This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The relays are sensitive types with currents up to 200 mA.
This circuit was originally designed for the practice of Morse code, something common in 1966, the year...
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
Using the 723 integrated circuit, this circuit was obtained from an article in the August 1971...