This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The indication is made through LED.
Found in RCA documentation from the 90s, this circuit uses components from that time. CA3019 is...
This circuit is from the 1977 RCA Linear Integrated Circuits Manual. The circuit has a...
This circuit has a 2 V full scale using a 4-and-a-half-digit A / D converter. The circuit is...