LM390 Intercom (CB25310E)

This two-channel wired intercom was found in the April 1990 issue of Radio Electronics magazine. Maximum cable distance depends on cable thickness.

| Clique na imagem para ampliar |

Bargraph Voltage Indicator (CB4893E)
This indicator makes use of an LM339 voltage comparator circuit that contains 4 internal...
Two-Transistor Darlington Amplifier (MSB035)
This two-transistor amplifier can be used as power stage for intercom, experimental receivers,...
20 A TTL Shield (CB7253E)
This circuit is from an old American publication, using transistors of the time and operating with a 48...