Getting ready to place my component order with digi-key for three THSTEP25's. The following items have a 500 min or a 100 min. Is there a substitute? ...
It looks like we're victims of the upcoming ROHS fiasco. I ordered some of those parts only three months ago with no problem, but now it looks like I have to...
I talked to digikey today and confirmed my suspicion. New part numbers for the capacitors are: 399-4266-ND and 399-4289-ND I'll update the BOM in the datasheet...
Just started soldering components to your board. Do I have to clean off hole in PCB before soldering? Having some problems with solder not sticking to board,...
The tinned PCB solders very nicely, BUT you must use more heat than you may be used to when soldering pads that are connected to the ground plane or other...
All backorders have FINALLY been shipped. Thankyou everyone for your patience. I soldered twice as many boards as I needed, so the THSTEP25-PS will be in...
Roughly how far out do you estimate until your servo controller is ready? I won't be ready for months as in process of etching boards now. Plan is to get my...
I assume the german one is the "UHU" chip. Are you looking for just a controller chip, or a complete servo driver? - Tom Scarince www.thsengineering.com...
I've changed the group settings to allow members to hide their email addresses. The goal is to reduce the chances of a spammer harvesting email addresses from...
Errr, forgot to finish the sentence: "New members start on moderated status and after their first on-topic post they are changed to unmoderated." This allows...
I really need to update the website. The hardware design for the 3 Amp servo controller is pretty straight- forward. However, a lot of work needs to go into...
I decided to try out some Weidmuller pluggable terminal blocks this time. The pins were tight in the PCB holes, but I persuaded them to fit. The only real...
John, The header is 281-1282-ND and the terminal block is 281-1246-ND. You'll need two of each per board. They are quite a bit more expensive than the fixed...
I got my Digikey order in for the THSTEP25-PS, and hopefully will get all the right parts. I decided against the good connectors, since they were VERY...
John, It seems that many people wire directly to the port with no problems. In a multi-axis system there will be some ground loops, so theoretically it is...
Thanks for the info. My motors are 4 amps parallel (2 serial) so I will have to hook them up wired serially. I have ordered all the parts and will give a...
Tom, Just starting to work on my A3977 board. Like most engineers have lots of questions, please bear with me as I have no electronic experience but follow...
First, it appears that you are not reading the current THSTEP25 datasheet! You seem to be looking at the "A3977 Prototype" page. You want to go here: ...
Ok, I've got everything on the board soldered. I've used all the components recommended. The only thing the board doesn't have is the PIC...but I did install...
Michael, ... There's your problem. You need to solder a piece of wire across RESISTOR R13, *not capacitor C13*. What you did was short out the 5v power...
Tom - Still having problems. I soldered across R13 and desoldered C13. I still have no voltage at TP1 & TP2 and the Vreg is still getting hot really quick. ...
After looking at the schematic for the board, and reading the A3977 instructions for Allegro again and again, I determined that I didn't need the jumper on...
Alright - I had the whole thing hooked up to the computer. The stepper would start twitching when I gave the "cut" command and stop when I hit cancel. It never...
Sorry you're having trouble. Glad you found the problem with J4 - it should normally not be connected. The "twitching" when you tried to make it move sounds...
Tom - I expected I would have some trouble. This is a brave new world for me! I soldered up another board and hooked everything up to the computer. This time...
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