![]() There is a switch on-delay circuit using a relay and MOSFET but no DC protection. I found that there was a very strong resonance at 400Hz, hence the notch filter before the driver circuit. it is driven relatively high to reduce the makeup gain required. The reverb was a pain to get sounding right due to it being such a small tank. It was originally wired for current drive but I found that I preferred the sound with voltage drive. ![]() The preamp uses TL072 dual op-amps throughout and uses an op-amp with a buffered output stage for the reverb driver, based on Rod Elliot's advice. The power amp is a basic discrete design using TIP31C/TIP32C output transistors and simple diode biasing. ![]() It also includes a speaker simulator that I got from this website: The design is pretty straightforward with pre-overdrive EQ (AC30 tone stack), diode clipping overdrive and spring reverb. I've been working on building a headphone guitar amp and wanted to share my progress as well as a few problems I'm having.
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