First post in these forums. Right off, want to thank the webmaster for running this site and also the OP for starting this thread. Found my way here from a reddit posting regarding stereo estim. Very useful information.
I have been stimming for 10+ years using a TENS, usually achieving HFO, but have always wanted to try stereo estim after reading about it on “SmartStim” when that website was active. Because of my success with the TENS, I didn’t feel the need to invest in a commercial box so seriously considered putting together a “Davey Box” but never got around to it. Even though I have some electrical experience and can solder, I know very little about electronics so even the Davey Box seemed a little daunting. I have read thru the thread and have studied the wiring / circuit diagrams. This project looks much simpler and also low cost.
I was ready to purchase one of the mini-amps (more on that) but had to ask the question is it really necessary? Several years ago, upgraded all of my home audio systems and have an excellent used Sony receiver on a closet shelf gathering dust. Only reason for replacing was the lack of digital / HDMI connectivity and multi-channel audio processing. The Sony is stereo only, mid 90’s vintages with working remote. Although not audiophile quality, it is upper level enthusiast grade with a true 100W X 2 RMS output (class AB amplifier). And, with the remote, no need to ever touch. I know it is over kill for this project but with careful volume control, so what. Is there any reason why I shouldn’t use this? Due to the amplifier power, should I use different resistors/components in the estim box?
If there are good reasons to stick with one of the mini amps, here are two that I am considering. Open to other suggestions if neither of these is suitable.
This one is based on TPA3116 based board for around $20. Like the Bluetooth capability. Not crazy about the output connection…would prefer banana plug sockets but, for $20, not bad. Plan on using a 19V 4.5A universal laptop power supply.
https://www.amazon.com/dp/B099W7YPJ8/
The other goes for around $40 which is high but comes with a remote control and a power supply. It is based upon AC6922A amplifier chip. Are these suitable? Seems like TPA3116 boards are preferred but may be due to low cost?
https://www.amazon.com/gp/product/B0868LMPNP/
The case and knobs of the mini amps appear to be metal. Should I be concerned about touching the mini amp? Will the external power supply isolate me from the “mains” power (power supplies indicate they are double insulated)? Suppose I could wrap the knobs in electrician tape but want to keep it unmodded of possible.
For the estim box, planning on mounting the resistors/transformers on a PCB. Would welcome recommendations on suitable box that will simplify mounting the PCB as well as mounting terminals and output jacks.
Thank you for your guidance. Looking forward to rigging this up.