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stimbox
diglet48 edited this page Dec 13, 2023
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My stimbox is a lolol2 design. Parts:
- TPA3116d2 stereo transformer. My sample is a chinese clone chip.
- elma TT IZ1892 transformers
- 3.9ohm serial resistor
- 22ohm parallel resistor
- 12v PSU
I performed many measurements on this box.
- Characterizing the elma TT IZ1892 transformer.
- Measuring the impact of the parallel resistor.
- Testing different values for the series resistor.
- Multi-phase modelling: multi phase circuits
Short summary:
- Parallel resistor is useless.
- This amplifier + transformer combination is very linear, constant volume over wide range of carrier frequencies.
- ...but, nerve sensitivity and skin resistance depends on frequency, so changing the carrier frequency still changes the intensity.
- Characteristics of three-phase configurations change as the carrier frequency changes.
The tl;dr is that if you want to keep things simple, pick a constant carrier frequency.