Sansui amplifier ans SPICE model - stage 2
Much has been added, and the circuitry duplicated for stereo reproduction. A recent image is shown:
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Sansui AU-505 and SPICE model
I've begun building a SPICE model of the Sansui amplifier. This will aid in troubleshooting the circuitry. This is the initial stage of development. I focus on the output stages and ignore unrelated elements such as phono input circuitry.
Preamp done
The SPICE simulations allowed me to pinpoint a problem in the circuit board without destroying fragile traces. The trace work for both channels of C3 was inferior. Each trace had errors when a component was inserted and soldered. I removed the capacitors, C3Left and C3Right, and hardwired them into the circuit using a piece of wire for each one. This completes the phono preamp. SPICE simulation results with no load, using LTSpice software: