Both transistors are low noise types. In the original circuit, I used BC650C whICh is an ultra low noise device. These transistors are now hard to find but BC109C are a good replacement. The circuit ...
This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high Frequency response, as demonstrated by applying an 100kHz squarewave to the input. ...
This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 ope...
Using a single op-amp this easy to make equalizer offers three ranges, low Frequency,mid frequency,and high. With component values shown there is approximately +/-20dB of boost or cut at frequencies ...
Based on the classIC Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the controls are passive, the last transistor provides a slight boost. Th...
Parts List:D1-D4: 1N4001 (4)C1,C20: 1000u CAP (2)C2,C11: 47u CAP (2)C3,C5,C7,C8,C12,C14,C16,C17,C21,C22: 0.1u CAP (10)C4,C6,C13,C15: 10u CAP (4)C9,C10,C18,C19: 2200u CAP (4)R1,R4,R9,R12: 1M RESISTOR ...
Many times we needed symmetrIC voltage, but we do not have the possibility him of taking immediately, from a existing supply. Then it will be supposed him we create from the existing single. This CA...
