[Tutorial] Building your own DIY E-Stim Stereo Device

[arig4711]

Thanks for this information, did you buy it over the german amazon.de link?
Maybe a change in production could happend... I have two of them -> both 12V 10A with class 2 and only 2 pins from the socket.

I have added this as a note to my guide, can't confirm this, only can say that I bought exactly this model over this amazon link and got a class 2 two times.

Yes, from amazon.de. If you have 2 pins, then it seems to be fine. Sometimes there are china power supplies with three pins (one GND-Pin) with a class II-sign, what couldn't' be right.

[19Hellothere83]

I have tested the new and old unit with the same files and have to say that the new unit feels much cleaner.
There is a little interference beteween the two channels in certain files but the new unit has not more interference than the old unit.

thanks lolol2 - really cool unit

[TakingMySweetTime]

Hello! thanks for the build info! I'm currently ordering my parts for my first build but am currently struggling to find the switches, How many pins do each switch need? thanks in advance!

[edger477]

Hello! thanks for the build info! I'm currently ordering my parts for my first build but am currently struggling to find the switches, How many pins do each switch need? thanks in advance!

Are you asking about triphase/polarity switches? You will need 6-contact switches, like these https://www.amazon.de/-/en/gp/product/B07G5KB51M

[TakingMySweetTime]

Hello! thanks for the build info! I'm currently ordering my parts for my first build but am currently struggling to find the switches, How many pins do each switch need? thanks in advance!

Are you asking about triphase/polarity switches? You will need 6-contact switches, like these https://www.amazon.de/-/en/gp/product/B07G5KB51M

Yeah I was asking about these, 1x Power switch with 3x In/Output -
1x Power switch with 1x In/Output for triphase

I wasn't sure where to get them from where I live but I was confused about the 3x in/output and 1x in/output because everywhere I looked I couldn't find any

[Muu1337]

I use XH-M189 which is based on TPA3116D2. It is absolutely enough with 12v power supply for this one also. I also have 3.9 ohm in series and 10 ohm in parallel (both are 25W resistors).

I design and 3d printed a case with a noctua silent fan (don't think it is necessary but I want to run everything super cool ). I also added 3 potentiometers on the input side to adjust balance between left and right channel. The third potentiometer is just for fine tuning the volume. Also added a triphase switch.

I just ordered a m18 Bluetooth 5.0 chip to add Bluetooth compatibility too (now I just have 3.5 mm AUX jack). For the m18 Bluetooth module I'll just be using a mini 560 5v buck converter to power it through the same 12v input for the amp.

I have used this setup for about a year and no problem at all.

[prishibok]

Please can someone share tri-phase cabel scheme for this device?

[lolol2]

You don't need any special triphase cable, just connect one black common port and enable the triphase switch.
The one cable you connected to that black port will be used as shared triphase common.
The other yellow and red port is channel A and B.

[Wexxxu]

Easy answer... I have seen people using the 22ohm in combination with the 3.9ohm and decided to use them too.
There was no big math behind that decision.

So I can't tell what exactly the diference to smaller ones would be.
I only can say that this combination is working for me.

According to my understanding this resistor corresponds block 9 of Smartstim community's StereoStimBox Ref. Max. v3 schema. When I was building my rig I asked in Smartstim forum about this resistor if I can leave it out (15R 2W in the ref. design) as it has been marked as an optional block. I got the answer that this resistor is there just to protect the amp in case the amp does not have a built-in short circuit protection (leads of the same channel touching each other). So, I don't have that resistor at all as I had the amp recommended by the Smartstim community and it should have that built-in protection.

[harryc]

Hey Guys, Part way through building my own box using this schematic:



Just had a questions regading the transformers.

mine look like this


I was wondering if I was correct in thinking I need to connect my wires to the 8Ohm and 0Ohm on the top section and the COM and 5W on the bottom to achieve the correct results?

Hopefully will be able to share my parts list and complete build when done which will be good for all wannabe UK builders

Cheers

[Spielers]

Hey Guys, Part way through building my own box using this schematic:



Just had a questions regading the transformers.

mine look like this


I was wondering if I was correct in thinking I need to connect my wires to the 8Ohm and 0Ohm on the top section and the COM and 5W on the bottom to achieve the correct results?

Hopefully will be able to share my parts list and complete build when done which will be good for all wannabe UK builders

Cheers

simply measure the the wireresitance on the side from the amplyfire you want to have the lowest possible ohm (->lowest n windings) and on the not-amplifire side (/connector/body-side) you want the highest possible ohm wireresitance(->higest n windings)

[harryc]

Hey Guys, Part way through building my own box using this schematic:



Just had a questions regading the transformers.

mine look like this


I was wondering if I was correct in thinking I need to connect my wires to the 8Ohm and 0Ohm on the top section and the COM and 5W on the bottom to achieve the correct results?

Hopefully will be able to share my parts list and complete build when done which will be good for all wannabe UK builders

Cheers

simply measure the the wireresitance on the amplyfire side you want to have the lowest possible ohm (->lowest n windings) and on the not-amplifire side you want the highest possible ohm wireresitance(->higest n windings)

Sorry to be a pain, i'm not 100% sure I get what you're saying

By amplifying side do you mean the side it's being amplified from or amplified to?

Also, what the best way to tell which side has the higher/lower no. of windings?

[Spielers]

Hey Guys, Part way through building my own box using this schematic:



Just had a questions regading the transformers.

mine look like this


I was wondering if I was correct in thinking I need to connect my wires to the 8Ohm and 0Ohm on the top section and the COM and 5W on the bottom to achieve the correct results?

Hopefully will be able to share my parts list and complete build when done which will be good for all wannabe UK builders

Cheers

simply measure the the wireresitance on the amplyfire side you want to have the lowest possible ohm (->lowest n windings) and on the not-amplifire side you want the highest possible ohm wireresitance(->higest n windings)

Sorry to be a pain, i'm not 100% sure I get what you're saying

By amplifying side do you mean the side it's being amplified from or amplified to?

Also, what the best way to tell which side has the higher/lower no. of windings?

In my Opinion you need to connect 8 Ohm and 0 Ohm on the side from the amplifire and on the other side com and 2.5W

[harryc]

Build is finally done, Just wanna check some of my results before testing it on skin

do the following sound safe?

Peak Voltage - 150V
Peak Current - 2mA

[edger477]

Build is finally done, Just wanna check some of my results before testing it on skin

do the following sound safe?

Peak Voltage - 150V
Peak Current - 2mA

Voltage does sound ok, but how did you measure current? What was connected to electrodes? Without load there is no current.