This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be applied to modern equivalent transistors.
This well-known circuit triggers a relay when light striking the phototransistor is cut off. The...
This Hartley telegraphy oscillator operates with the transmitter signal generating a tone in a...
The gain for this circuit is given by the ratio R1/R2. The circuit must be powered from a dual...