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Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
ok Daniel im officially stuck. I get no output of U53 or U4. Both of which i have changed twice. However i get a signal out of U3. I got the VU meter working great and it seems to be blinking to the music, however when I hook up J2 to the Tesla i get nothing. =(
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Check your voltage at pin 5 of U4. You should be getting a voltage level there greater than 6V i think. R10 is open right? If not, then increase gain of ENV amp R3. Check all stages with oscilloscope etc...
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
Dr. Shock wrote ...
Check your voltage at pin 5 of U4. You should be getting a voltage level there greater than 6V i think. R10 is open right? If not, then increase gain of ENV amp R3. Check all stages with oscilloscope etc...
pin 5 shows +5 volts and r10 is open, jmp1 is also at the "B end" of the jumper if that helps any. I currently am not near a scope. Any other ideas?
Registered Member #1157
Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
Wirenut wrote ...
Here's a close-up pic of my GDT
The red and blue wires are twisted together. There are 20 turns of the red/blue around the core. You can see the red wire is connected to s2 and g2 on the left side of the board. The blue wire is connected to s1 and g1 on the right, but is not visible.
Heya guys, quick question. Just about to connect the Windings of the GDT to the Half-bridge. Lemme see if I gets this straight.
The side I started winding from will be turn 1 and the side I ended on is turn 20.
If I used red= G1=S1, blue= G2+S2 and green as the 10//10. Will turn 1 red =S1 and turn 20 red =G1, and turn 20 blue =S2 and turn 1 =G2?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I sent a PM. Yes, this sounds correct. Both secondaries are out of phase from each other. Anyways, you'll find out if its right when you do your scoping at the gates (no bridge power) Just make sure everything looks right before applying DC bridge power, otherwise, you'll blow both them IGBTs like a drunk miner with a box of old dynamite.
Registered Member #1524
Joined: Sun Jun 08 2008, 05:25PM
Location: Grand Junction, Colorado
Posts: 38
I want to build a miniBrute. I have reviewed the parts list and with a few exceptions it looks like all the parts should be easy enough to get. The project has been completed by others and it looks like there is an amazing amount of experience on this forum, and even real nice PCB's.
However this project is well over my head. I have the basic theory and process down but how that is being done in the circuits is flexing my mind a bit. With that said I have come across a few parts issues and there potential substitutes. I have simply made my best guess. If anyone can spare some time to look over these numbers they are all from Digikey except the IGBT's witch it looks like the HGTG20N60A4D will work in the place of the HGT1N60A4D but the heat sink will need to electrically isolate the IGBT's from one another, ground and remove the heat better.
Ill order the miniBrute book and the boards now, and wait on the parts. I want to add the XenoSonic Audio Interface as well but I think it best to make an operation DRSSTC first.
Registered Member #1153
Joined: Mon Dec 03 2007, 07:27PM
Location: Croatia
Posts: 213
Rollingblackout wrote ...
Ill order the miniBrute book and the boards now, and wait on the parts. I want to add the XenoSonic Audio Interface as well but I think it best to make an operation DRSSTC first.
Sems now us two will build this project in same time. I ordered book yesterday and now i will order boards
Registered Member #1157
Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
There is an Unknown tantalum Capacitor on page 81 in the upper left corner.
I have not found an image online that shows this capacitor, but rest assured, the book shows that there is a capacitor here. What capacitor is this in the parts list, or is it not in the parts list.
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