This is the preamplifier section. At the top left, there is a voltage divider to create a virtual ground for the opamps. Down on the left is the input and downmix of stereo channels to mono. After a buffer, the signal is sent to the tone control section and then output with another buffer section. The input and output buffer sections apply 8 dB of gain each.
Schematics For The Power Management Section
Power management is a strong name, but this is exactly what this circuit is doing.
The circuit has a DC input, battery connections, LED outputs for power and charging, a charger circuit and relays for routing.
On the first tests the relay no.3 (output relay) was fried because it was connecting a full capacitor to the empty capacitors at the amplifier board input and this drew enormous current. I solved this problem by reducing the 2200micF cap with a smaller one and installing a better (8 ampere) relay. Now it works more reliably.
Built Electronics
This is the electronics section built on an aluminum board which also serves as the heatsink for the amplifier. At the top is the power management and bottom left is the preamplifier. Bottom right is the amplifier and limiter/DC regulator on top of each other. All of the electronics of Patrick are right here. This piece goes where the larynx of Patrick would be located.
The Electronics Board
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