Mini Amplifier with IC LM1895N

This little amplifier, operating from 3…9 V, and providing 1 W output into a 4 4 loudspeaker, is one of those circuits of which you never have enough. The amplifier is based on one 8-pin DIL IC type LM1895N. Electrolytic capacitors C2 and C6 de- couple the supply lines; C7 prevents d.c. reaching the loudspeaker;…


TDA1521-Integrated Stereo Amplifier

The Type TDA1521 from Valvo/Mullard is an integrated HiFi stereo power amplifier designed for mains fed applications such as stereo TV. The device works optimally when fed from a ± 16 V supply, and delivers a maximum output power of 2 x 12 W into 8 Q. The gain of the amplifiers is fixed internally…


Guitar and Microphone Amplifier

This simple audio power amplifier works with guitars and microphones, delivering an output power of around 20W over a load of 4 ohms.  The amplifier circuit is built around IC TDA2005M and a few discrete components. It uses only one potentiometer (VR1), which is quite advantageous as potentiometers take up a lot of space on…


Stereo Power Amplifier Using IC 7905

79xx is a widely known series of low-cost, fixed-negative-voltage regulators. These integrated circuits are available with output current of 100-150 mA (L series), 0.4-0.5A (M series), up to 1A (standard series), etc. They can be used in many applications other than regulators, audio power amplifier being one of them.  As shown in the circuit diagram,…


Vocal Adaptor for Bass Guitar Amp

These days, music is a major hobby for the young and not-so-young. Lots of people  enjoy  making  music,  and  more  and  more dream of showing off their talents on stage. But one of the major problems often encountered is the cost of musical equipment. How many amateur music groups sing  through an amp borrowed from…