Mistypanda22 wrote: Fri Feb 23, 2024 3:00 am just have a few questions on the way this is supposed to work in general, as a lot of sources kind of... don't blatantly tell people how things work, and it would come down to trial and error.
1. The box pictured is using aux sockets for the outputs (indeed the two middle ones), so with them they have two connection points in each connector (one is further in than the other) so for these both wires from one transformer was wired into the aux jack.
Many also use banana plug sockets for the outputs with them you would use two sockets for each transformer as they only take one wire per socket (contrasted to the aux plug which "merges" two cables into one socket
2. This can wary a little based on the transformer you are using. (Technically we use the transformer backwards when using them for estim) But for wiring assuming the same transformer as used in the original post:
Audio negative from amplifier to the transformers "0"
Audio positive from amplifier to serial resistor, out of the resistor to transformers 8ohm
"out" from transformers "C"/"Common" to your electrode plug "Negative"
"out" from transformers "0.5 W Purple" to your electrode plug "Positive"
3. This again is dependent on the transformer you are using, with the ones from the original post you want the purple "0.5W" one. The reason this changes is that we are looking for the best turn ratio which depends on what transformer is being used :)
4. This is one i don't have a really good answer to you on, personally i test my device on my thigh using pads, before this i often use a ohm meter to quickly check for no direct shorts between anything. If anyone has a better more "proper" way to test devices i would love if you would chime in!
5. This again depends on what connector your using for your electrodes, if your using banana plugs or bullet plugs you already have 4 separate wires to hookup to your electrodes, in the case for something like audio plugs (aux) the split happens in the connector kinda like this image just image only two wires:
6. Thri-phase is at its core connecting the two negatives of the transformers electrode wire together, this allows us to drive 3 electrodes together that can be used to get a feeling of movement, as an example you can make the stim feel like its moving up and down. (so basically instead of having two sets of electrodes being driven entirely separately we make 3 electrodes have an output that depends on each other) Many boxes have included a switch to connect these two negative cables together at the box but you can also do this with your wires going out from your box directly, tough it can be a bit more fo a wire mess.
7. The parallel resistor, even tough many swear by it (sorry to anyone that does!) is not needed, frankly from any testing i have seen actually makes the signal slightly worse from a data standpoint. You can read a bit more about this here:
https://github.com/diglet48/restim/wiki ... l-resistor
Incase you also want to read a little about the series resistor you can find that here:
https://github.com/diglet48/restim/wiki ... s-resistor
8. Besides the basic parts you must have to make the device (Transformers, Amplifier, Power brick and plug and perhaps a box to house it in) here are a few other parts i suggest getting:
A power switch (if you want to make sure your amp does not make an unpleasant pop when being turned on or off you might want to consider a 4PST switch (its essentially a switch that flips 4 sets of switches in one, where you connect power and each electrode wire to make all of them switch on or off at once) If needed i can make a quick wiring diagram for this.
Electrode sockets - Personally i use 2mm banana sockets and 2 mm plugs on the electrode wires (If you do this you will need 4 sockets, i recommend two set of colors) so you have Transformer 1 positive to a red socket and negative to a black socket, repeat for transformer 2)
Alternatively you can also use aux sockets, they are a bit more fiddly to wire up as things a re a bit smaller, with these you would only need two, its quite popular to use these if you already have electrode wires that uses aux
A thri-phase switch, any basic on-off switch that connects the two Negative electrode wires, just makes using thri-phase a bit simpler.
As an alternative if you prefer chatting over a platform like discord for some quicker answers feel free to add me on Discord username: makeyourkink
the more you know
