Blaino Posted February 15, 2020 Report Share Posted February 15, 2020 Can I be added to the group buy for 8 * GRHVxxx 4 * GRLV78xx 4 * GRLV79xx 4 * main board 2 * Mini T2 board Quote Link to comment Share on other sites More sharing options...
judo Posted February 16, 2020 Report Share Posted February 16, 2020 If it was not too late: 2x GRHVxxx1x GRLV79xx1x GRLV78xx1x Main Board 1x miniT2 Quote Link to comment Share on other sites More sharing options...
mwl168 Posted February 17, 2020 Author Report Share Posted February 17, 2020 Table updated. Quote Link to comment Share on other sites More sharing options...
s_r Posted February 29, 2020 Report Share Posted February 29, 2020 Please add me for the following: 4x GRHVxxx2x GRLV79xx2x GRLV78xx2x Main Board2x miniT2 Thanks. Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 2, 2020 Author Report Share Posted March 2, 2020 (edited) Table updated! Also, some progress updates: I tested the timer, relay and LV sections on the Main Board and they all work as designed. I am very close to sending final boards to fab house for quotes. With some luck with remaining tests, it may happen this week. With that in mind, a few things we need to all think about and decide. Please share your thoughts on this thread: 1. A reminder - the GRHVxxx and GRLV boards will not work by themselves as stand alone regulators. The rectifiers, filter caps, current limit circuit for HV are on the Main Board. 2. You can use 78xx/79xx regulators to replace GRLV boards if so desired. In fact, that's how I tested the Main Board. 3. The default timer setup on the main board is about 45 seconds. You can change a couple parts to adjust. The timer and relay circuits are both optional and can also be replaced with external modules. 4. R7, 8, 9, 10 on the GRHVxxx board set the regulated output voltage. A couple of items to think about and decide: 1. We should consider, as I have mentioned before, if to have the GRHVxxx board either fully or partially assembled. I hand-soldered all the SMD parts on the main board. It's manageable. The GRHVxxx is another matter - it's small and operates on very high voltage. Soldering the HN4A51J part alone is no bargain. 2. This GB has dragged on for some time. If you have changed your mind about the item quantities, etc., please post them here and I will update the table. We need final counts to get quotes. More update to follow! Edited March 3, 2020 by mwl168 2 Quote Link to comment Share on other sites More sharing options...
jose Posted March 2, 2020 Report Share Posted March 2, 2020 Thanks to share your progress MWL. I keep my units. Personally I would opt for a partial assembly (if the price does not increase too much). Some components are quite complicated to solder. Quote Link to comment Share on other sites More sharing options...
judo Posted March 2, 2020 Report Share Posted March 2, 2020 That HN4A51J compared with the TPS7A... regulators seems easy. Maybe I am not right I did not do much similar. Is this the hardest solderable part ? The size is the main problem or stg else? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 2, 2020 Author Report Share Posted March 2, 2020 Have not worked with TPS7A. Hand-soldering a tinny part on a small PCB is a challenge by itself. Add high voltage application which is not forgivable if the soldering job is less than tidy. Quote Link to comment Share on other sites More sharing options...
judo Posted March 2, 2020 Report Share Posted March 2, 2020 (edited) Thanks! For the answer and for the much work. You know the the TPS7As were a real challenge with the mini dynalo, Kerry's (and Kevin Gilmore) design. So I thought there were some experiences. Edited March 2, 2020 by judo Quote Link to comment Share on other sites More sharing options...
s_r Posted March 2, 2020 Report Share Posted March 2, 2020 I'll take partial assembly if it means some peace of mind when it comes to the HV boards, personally. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted March 2, 2020 Report Share Posted March 2, 2020 After looking at posts by Kerry regarding the GRHV boards I think it might be a good idea for builders of the mini T2 to even build Kerry’s regulators. To me those boards seems doable and they aren’t any more difficult than the amplifier boards nor significant higher voltages either. The more you solder the better you get at it. Quote Link to comment Share on other sites More sharing options...
G600 Posted March 3, 2020 Report Share Posted March 3, 2020 (edited) I confirm my interest, assembled boards or not. Edited March 3, 2020 by G600 Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted March 4, 2020 Report Share Posted March 4, 2020 Preassembled boards will be nice. Quote Link to comment Share on other sites More sharing options...
Blueman2 Posted March 4, 2020 Report Share Posted March 4, 2020 I remain committed to the buy, but definitely prefer as much pre-assembly as possible. Willing to pay for more assembly, even if there has to be a sub-buy for those wanting it. Quote Link to comment Share on other sites More sharing options...
HatIsMyFriend Posted March 4, 2020 Report Share Posted March 4, 2020 I don't mind either way. If it's assembled though, would the voltage setting resistors be left blank for flexibility, or would it be set to +400 -460? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 4, 2020 Author Report Share Posted March 4, 2020 If we go with assembled GRHVxxx boards, I like to leave the 4 resistors used to set the output voltage blank so builders can configure their desired output voltage, These resistors are 1206 parts and fairly easy to solder. 4 Quote Link to comment Share on other sites More sharing options...
judo Posted March 4, 2020 Report Share Posted March 4, 2020 Preassembly less fun. I have bought a Quick 861DW hot air station and I would like to play with it.😀 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted March 4, 2020 Report Share Posted March 4, 2020 Any chance for a GRHVxxx BOM? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 4, 2020 Author Report Share Posted March 4, 2020 6 hours ago, JoaMat said: Any chance for a GRHVxxx BOM? Will post the BOM for the boards on the first post in this thread later when all tests are done. Quote Link to comment Share on other sites More sharing options...
thuytn Posted March 4, 2020 Report Share Posted March 4, 2020 Please add me for 5x mini-T2. Thank you for your hard work. Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 4, 2020 Author Report Share Posted March 4, 2020 39 minutes ago, thuytn said: Please add me for 5x mini-T2. Thank you for your hard work. Do you just need 5 sets of mini T2 boards or do you also need the PSU boards? Quote Link to comment Share on other sites More sharing options...
mumford Posted March 4, 2020 Report Share Posted March 4, 2020 I probably take GRHVxxx fully assembled. High voltage + tiny smd = high probability of burned pcbs. I have a hot plate and can do smd soldering. But I am pretty sure that GRHVxxx is two-sided, and requires hot air or an oven. Quote Link to comment Share on other sites More sharing options...
Discom Posted March 4, 2020 Report Share Posted March 4, 2020 Could I adjust to 6x GRHV, 8x GRLV78xx, 8x GRLV79xx, 3x main board, 1x mini T2? I don't particularly need the GRHVs to be preassembled. If the cost increase is reasonable I wouldn't mind but otherwise I'd prefer to stick with bare boards. Thanks for your work on this! Quote Link to comment Share on other sites More sharing options...
mikeymad Posted March 4, 2020 Report Share Posted March 4, 2020 On 3/2/2020 at 11:05 AM, jose said: I keep my units. Personally I would opt for a partial assembly (if the price does not increase too much). Some components are quite complicated to solder. ^this Quote Link to comment Share on other sites More sharing options...
thuytn Posted March 4, 2020 Report Share Posted March 4, 2020 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 Quote Link to comment Share on other sites More sharing options...
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