In the figure we have a circuit in which two moving bar/dot indicators are connected together to increase the number of LEDs. The circuit is from a Radio Electronics from October 1980.
This circuit is intended to monitor the flame of gas heating systems that must always have a small...
This circuit is used with high impedance microphones, such as ceramic or crystal capsules. The...
This soft starter dimmer was found in a 1980s documentation. We can implement it with current...