We found this circuit in an American publication from 1977. The circuit drives two LEDs according to the control of the inputs. The technology is TTL requiring 5 V to power supply.
We found this circuit in an old Popular Electronics. The circuit can be applied to other...
With this circuit it is possible to receive the signals from the 11-meter band (27 MHz) in a...
We found this circuit in an American publication from the 90s. The transistors must be provided with...