thuytn
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Posts posted by thuytn
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56 minutes ago, mwl168 said:
The GRLV boards can work as direct plugin for the 78xx/79xx parts.
Thanks!
Could you please revise my quantity to:
6x mini-T2
1x mainboard
2x GRHV (bare boards)
1x GRLV78xx (bare board)
1x GRLV79xx (bare board)
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I wonder what’d be the next price break for the mini T2? I have a couple of friends who are also interested in the boards, so they might buy some sets along with me.
Also, does the GRLV work as a direct plug in for the LM78xx/LM79xx? I’m thinking of using them to upgrade with stock PSU.
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4 hours ago, mwl168 said:
Do you just need 5 sets of mini T2 boards or do you also need the PSU boards?
I just need the amp boards
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Please add me for 5x mini-T2.
Thank you for your hard work.
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Since I've got the Carbon up and running for a couple of months, I'd like to bring it up to another level and have been thinking of the Circlotron for a while.
I wonder if there's any interest in the board sets? These would be 2mm/3oz with latest files posted by Kevin. I could also provide Nippon-Chemicon 470uf 550v caps.
I'm not using any off-the-shelf chassis though, it would be built from scratch, but I guess a standard 5U one would work fine. Probably I will do like EUVL did with his F5X chassis, with both output and driver boards stacked on both sides of a thick teflon sheet. Same thing with the single 900v PSU.
These are the boards that I'm thinking of ordering. Both Driver and Output are v2, PSU is v3. The GRHV is a dual version, not singles because I plan to mount the transistors on the bottom plate.
Feel free to PM me if you have any interest. This is my first time doing this so any if there is any inconvenience, please pardon me.
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These values should be noted on the silkscreen to make it easier for anyone who wants to fool around with different output voltages.
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Thanks, Pars. I managed to find the schematics in that folder.
Those TO-3 transistors are not a problem, I have many of them left from projects in the past.
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I happen to have some KSA5 alternative supply. I wonder what parts need to be changed to get it output +/-18v (Dynalo) and +/-30v (Dynahi) respectively? Would the 2x18V and 2x30V transformers work here? I tried to find a link to the schematics but all seem to be dead now.
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Thanks, Pars.
There is a local shop here who still has a couple thousands of each. All in original boxes.
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I'm working on a BOM for the Dynalo. Most of the parts can be sourced locally but so far I couldn't find the 402R resistor. Would it be possible to replace them with 390R which is the closest value my local vendor carries?
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I am working on a Dynahi version with onboard TO-220 heatsinks.
One amp board works fine. The other one is having problem with DC offset. It’s stuck at around 112mV, and I can’t get it down to zero. ? I’m using the 2sc3381/2sa1349 instead of the THAT340. Voltage drop on 10R resistor is 370mV which is accept for the onboard one.
Any suggestion on how to zero the offset?
Thanks!
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James,
I’d love to have a look at the gerber.
Also from the amp board, I can’t find the 470r resistors connected to G2. From what I saw from others’ builds, looks like there’s a newer revision.
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Is this the board you are looking at? I'm also thinking of having some boards made but notice the PZTAs are in to-220 package, not to-92 or smd.
Probably there is a newer revision but I couldn't find it until now.
I'm also interested in a dual rails single board GRHV with soft-start.
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DIY mini T2 Build Thread
in Do It Yourself
Posted
Wrong thread, sorry.