For shorter periods, a capacitor can be used to isolate the switch _ Designed by Bill Bowdenħ band graphic eqalizer - Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. _ Designed by Rod Elliott ESPĥ55 Timer MonoStable using Pushbutton The two circuits above illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The original design was very conservative, and was initially intended to use 2SA1492 and 2SC3856 transistors (rated at 130W)with 200W (or 230W) devices, some of the original comments and warnings have been amended to suit.
Recent testing has shown that with the new ON Semi transistors it is possible to obtain a lot more power than previously. Maximum boost 20dB is only realized with maximum supply voltage _ Designed by Andy Collisonģ00 Watt Subwoofer Power Amplifier - There are some important updates to this project, as shown below. Supply voltage may be anything from 6 to 30 Volts. With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz. _ Designed by Carlos Feldmanģ Band Equalizer - Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high. Carlos has used this amplifier on his AM radio for many years. Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 3%, _ Designed by Andy CollisonĢ Watt Amplifier - An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load. At that time I had only an analogue meter and a calculator to work with.
This was one of the earliest circuits that I ever designed and built, in Spring 1982. 2 Watt Amplifier - A 2 Watt audio amplifier made from discrete components.
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