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MINI_STEREO

2017-01-03 18:13  
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MINI_STEREO
This circuit is built around two chips: the MC1458 dual op amp, configured as a preamplifier, and the LM378 dual 4-watt amplifier. The gain of the preamp is given by R3/R1 for one side and R4/R2 for the other side, which is about 100. That gain can be varied by increasing the ratios. The left and right channel inputs are applied to pins 2 and 6. The left and right outputs of U1 at pins 7 and 2 are coupled through C5/ R10 and C3/R6,respectively, to U2 to drive the two 8-Ωloudspeakers.