Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz. The circuit has a gain of approximately 30 dB. Bipolar transistors are general-purpose types.
I found this circuit in a 2005 Wireless World and it is ideal for driving high power white LEDs....
Figure 1 shows a simple audio oscillator driven by the SCR When the sensor is closed. The circuit...
This circuit adjusts the drained current to values up to 20 A, allowing the testing of power...