TREAD HELP

[bjackson]

I am testing my tread today (made with parts from the tread kit), and I am testing the AC voltage between 1 and 3 (the "unregulated voltage infront of the rectifier") and I am getting 73 volts! (I am using a 24v transformer). I am getting 24 volts in, but 73 at points 1 and 3. My output voltage I can set correctly with the VSET trimmer.

Is something wrong, or is my meter bad because its measuring peak to peak not RMS? Thanks!

 

[Jazper]

Quote:

Originally Posted by bjackson I am testing my tread today (made with parts from the tread kit), and I am testing the AC voltage between 1 and 3 (the "unregulated voltage infront of the rectifier") and I am getting 73 volts! (I am using a 24v transformer). I am getting 24 volts in, but 73 at points 1 and 3. My output voltage I can set correctly with the VSET trimmer. Is something wrong, or is my meter bad because its measuring peak to peak not RMS? Thanks!

hmm is it a 24-0-24v transformer? did you wire it up in series? this could be the problem

 

[tangent]

Quote:

Originally Posted by bjackson is my meter bad because its measuring peak to peak not RMS? Thanks!

Could be. Non-RMS reading meters handle sine waves fine, but not the "camel humps" of an unregulated DC supply.

Assuming you're using the 63V cap I recommend for the TREAD, the fact that it hasn't exploded yet suggests that the actual voltage is lower.

I wouldn't be 100% confident that the meter is at fault, but there's cause to be cautiously optimistic about the TREAD still.

 

[Jazper]

Quote:

Originally Posted by tangent Assuming you're using the 63V cap I recommend for the TREAD, the fact that it hasn't exploded yet suggests that the actual voltage is lower.

"but the creature is inside out..... and it exploded" - Galaxy quest...



/couldn't help myself

 

[peranders]

Quote:

Originally Posted by bjackson I am testing my tread today (made with parts from the tread kit), and I am testing the AC voltage between 1 and 3 (the "unregulated voltage infront of the rectifier") and I am getting 73 volts! (I am using a 24v transformer). I am getting 24 volts in, but 73 at points 1 and 3. My output voltage I can set correctly with the VSET trimmer. Is something wrong, or is my meter bad because its measuring peak to peak not RMS? Thanks!

If you measure with 10 MOhms (only the DMM) at a rectifier bridge you must also include all caps etc. so if you really want to test you must attach a load like 3-10 kohms. Just put a resisitor across the voltmeter.

What you are measuring now is some kind of capacitive voltage division, not very intersting.

 

[bjackson]

Well I installed it in my case on Monday, and have been using it since and it's worked great, and the TREAD sounds great.

Hasn't exploded yet and I've left it on for 6 hours at a time. Man that power supply is great, dead silent. I want to upgrade the power supply of every device I own