Mixer986

The acoustic mixer is a device that allows us to record on a tape a mixed literary-musical program - for example, a message with a musical background, the transition from one melody to another by overflowing and changing the volume, etc. It is therefore a miniature DJ's device, similar to those used in radio stations and discos. The mixer can be used not only for recording on a tape recorder, but also for live transmission.

 The electrical circuit of this home mix console is charged with rechargeable batteries from R6 type with 1,5V each, for which i have not assumed a place in the circuit board. With this solution it is practically removed the opportunity for transferring parasitic voltages between the attached devices to the mixer (like the audio power amplifier, which can be found in m profile) and also blocks the incoming low-frequency noises from the main power supply.

 As the current consumption does not exceed 0,5 mA, one set of battery works for a very long time. The use of transistors instead of operational amplifiers provides low noise coefficient.