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Circuit Bench

  • Shortwave 80 meter band Transmitter (CB23550E)

      This transmitter was sent by contributing reader Adriano Muniz Moura from Pirapora – MG. It is in...

  • Grid dip meter (CB3920E)

           This simple circuit with bipolar transistors is from a 1970s American documentation. The RF...

  • Set Reset Flip Flop (CB20675E) Found in a 1968 documentation, this circuit can be applied to any logic. In this case, we have an example for TTL. a href="images/stories/bc/203509352025_002235_0001.gif" target

      With the first project we present, a relay is activated in the presence of light. We can use it as...

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