Simple Car Preamplifier and Artificial Earth


Posted on May 17, 2012

The preamp circuit is completely conventional, and by necessity is AC coupled throughout. The artificial earth is derived by two resistors (R1 and R2), which will set the `earth` at exactly 1/2 the supply voltage. This is nominally 13.8V in all cars, since this is the proper charging voltage for a 12V battery. To reduce the maximum gain, simply reduce the values of R105 and R205. For example, reducing these to 4k7 will provide a maximum gain of 3 (10dB), which in reality is probably enough.


Simple Car Preamplifier and Artificial Earth
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