Mixer circuit above has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a slight loss is always introduced. The final summing amplifier [...]

audio amplifer 120watt circuit

Here is a simple and easy to build general purpose 120 W. Amplifer with IC number TDA7293 for process sound system.
This amplifer was have the input for a radio, TV, stereo or other line level device.
It also has a phono input for a record player, guitar, microphone or other un-amplified source.
With the [...]

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Charge your iPod without connecting it to a computer!

Using the USB port on your computer to charge your player’s batteries is not always practical. What if you do not have a computer available at the time or if you do not want to power up a computer just for charging? Or what if you [...]