Based on @optilude project at https://github.com/optilude/MuleBox, the JohnH attenuator at https://marshallforum.com/threads/simple-attenuators-design-and-testing.98285/, @keyth72 funbox experience/code we have played with for awhile now!, and the @newkular hothouse PCBA from jlcpcb to save some time on a board spin!
My code is here: https://github.com/xconverge/FunBox/blob/tweaks/software/AsteroidBelt/asteroidbelt.cpp
I tried a TDA2822 based headphone amp first and found it quite noisy, but this LM4881 based one sounds great and fits so I didn't see the need to make my own PCB. The headphone amp is perfect for my usage, sounds great and even though the daisy can get pretty loud, it still isn't the same as some proper/maybe non-advisable volume into the ears.
My amp is only 1W so I don't really need an attenuator, this is for silent headphone use or bypassed entirely. Also because its a 1W amp, I added a switch to leave the fan off because I don't think I really need it/the buzzing of the fan.
Knobs are Level, Plate Reverb, and 3 band EQ. Knob 3 is unused.
Toggles are IR1/IROFF/IR2, pre-IR bass boost amount, and stereo spread enable
The stereo spread is basically always on, I like it a lot.
I used 16awg for the load section and wish I had used 18awg or 20awg instead, some of my grossest joints to date, but eh...
My code is here: https://github.com/xconverge/FunBox/blob/tweaks/software/AsteroidBelt/asteroidbelt.cpp
I tried a TDA2822 based headphone amp first and found it quite noisy, but this LM4881 based one sounds great and fits so I didn't see the need to make my own PCB. The headphone amp is perfect for my usage, sounds great and even though the daisy can get pretty loud, it still isn't the same as some proper/maybe non-advisable volume into the ears.
My amp is only 1W so I don't really need an attenuator, this is for silent headphone use or bypassed entirely. Also because its a 1W amp, I added a switch to leave the fan off because I don't think I really need it/the buzzing of the fan.
Knobs are Level, Plate Reverb, and 3 band EQ. Knob 3 is unused.
Toggles are IR1/IROFF/IR2, pre-IR bass boost amount, and stereo spread enable
The stereo spread is basically always on, I like it a lot.
I used 16awg for the load section and wish I had used 18awg or 20awg instead, some of my grossest joints to date, but eh...
