Cable Test (CB25206E)

Found in the March 1989 issue of Radio Electronics magazine, this circuit is used to test printer and other cables. The indication is made by LEDs.

| Clique na imagem para ampliar |

4-Channel Comparator (CB24632E)
The basis of this circuit is the HA2400 released at the time. The circuit is from a Radio...
Interface shield (CB7260E)
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...
Power Failure Indicator (CB6113E)
This circuit can be found in a 1970 Motorola documentation. The circuit can be implemented with general...