We found this circuit in the 1983 edition of the Electronics Experimenter handbook. The circuit uses components that are common today, although many admit equivalents.
The figure shows how to use the LM3914 bargraph with expanded scale. The circuit has two...
This receiver activates a relay from signals emitted by a 27 MHz modulated transmitter as...
The transistor in this circuit can be replaced with any general-purpose equivalent. The time...