DHT Heater using VCCS - PCB or Kit (Possible Group buy)
#991 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
I received a delivery of back ordered parts today so I can start shipping again, I'm still short the 1K Carbons for just two remaining boards and will go hunting for those.
I owe.....
Mick : 2 x large
Thomas: 4 x large
Neal : 4 x large
davedms: 2 x large
Michael L 2 x large
For those going to Owston, please shout up via PM, we can save postage, if you're not in a huge hurry.
Andrew
I owe.....
Mick : 2 x large
Thomas: 4 x large
Neal : 4 x large
davedms: 2 x large
Michael L 2 x large
For those going to Owston, please shout up via PM, we can save postage, if you're not in a huge hurry.
Andrew
Analogue, the lost world that lies between 0 and 1.
#992 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
I've heard from Mick, anyone else care to choose Owston or the Royal Mail?
best regards,
Andrew
best regards,
Andrew
Analogue, the lost world that lies between 0 and 1.
#993 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
I can't get to Owston. I'm in no hurry so please post mine last if it helps.
#994 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Yep, mail mine too please, I'm sure I have some 1K cc so don't worry about those for me if this helps.....Ta
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#995 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
I'm just building up 2 boards for 45's now . Finding myself a bit short of parts, from the original order - probably because of various trials/experiment with GK-71 etc . No bother, but just need to re-cap :
The 1.5A board probably came with 50mm heatsinks originally - I have some 63mm high ones , which I suppose may be for the 3A boards, but given the dissipation at 1.5A, I suppose these would be a good choice ? Do you have a Farnell or RS part number to hand on these ?
Green LED's - any will do, and I think the short lead goes to the 'flat' on the PCB ?
D44H11 is the preferred part ?
The C0G caps - did you end up with epoxy or non-epoxy caps in the end ?
A link to the part would be handy since you just bought a load of them.
Thanks in advance for any info, no rush.
edit : one more thing - I still have a couple of TIP122's, are they OK in this application ( did the circuit change ? ) for 1.5A ?
The 1.5A board probably came with 50mm heatsinks originally - I have some 63mm high ones , which I suppose may be for the 3A boards, but given the dissipation at 1.5A, I suppose these would be a good choice ? Do you have a Farnell or RS part number to hand on these ?
Green LED's - any will do, and I think the short lead goes to the 'flat' on the PCB ?
D44H11 is the preferred part ?
The C0G caps - did you end up with epoxy or non-epoxy caps in the end ?
A link to the part would be handy since you just bought a load of them.
Thanks in advance for any info, no rush.
edit : one more thing - I still have a couple of TIP122's, are they OK in this application ( did the circuit change ? ) for 1.5A ?
"Once you find out ... the Circumstances ; then you can go out"
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#996 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Reason I asked about epoxy again is it seemed towards the end of the design you'd found a solution to this, having done a bit more reading I suspect the change to D44H11 made the epoxy problem less audible. I had a quick look on Farnell and found 2 different types of 0.33u with no mention of epoxy in the datasheet, but I suspect it would take more prying to be 100% sure of that ?
"Once you find out ... the Circumstances ; then you can go out"
#997 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Hi Mark,
Non epoxy caps, not taking that risk again
http://uk.farnell.com/kemet/c2220c474j5 ... m%2Fsearch
Pretty much any green LED, I use the HLMP Y502, data sheet can be found here
http://uk.farnell.com/broadcom-limited/ ... m%2Fsearch
D44H11 is the preferred part for the non-GM70 builds
Andrew
Non epoxy caps, not taking that risk again
http://uk.farnell.com/kemet/c2220c474j5 ... m%2Fsearch
Pretty much any green LED, I use the HLMP Y502, data sheet can be found here
http://uk.farnell.com/broadcom-limited/ ... m%2Fsearch
D44H11 is the preferred part for the non-GM70 builds
Andrew
Analogue, the lost world that lies between 0 and 1.
#998 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
I don't recognise that part Andrew, is that only for some type of boards ?
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#999 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Thanks
Heatsinks - is this the one ?
Took a bit of time to find one with three holes -
http://uk.farnell.com/fischer-elektroni ... dp/1319812#
Heatsinks - is this the one ?
Took a bit of time to find one with three holes -
http://uk.farnell.com/fischer-elektroni ... dp/1319812#
"Once you find out ... the Circumstances ; then you can go out"
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#1001 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Nice detective work !
Not quite as bad an error as the one I made when getting a board done for GM70, using a 24V SMPS as the input to the board. I connected the 24V in the wrong way round, and was wondering why the LM358P's kept exploding like little firecrackers !
Ps. Nick says the above heatsink link is correct, if anyone has to buy any more.
Not quite as bad an error as the one I made when getting a board done for GM70, using a 24V SMPS as the input to the board. I connected the 24V in the wrong way round, and was wondering why the LM358P's kept exploding like little firecrackers !
Ps. Nick says the above heatsink link is correct, if anyone has to buy any more.
"Once you find out ... the Circumstances ; then you can go out"
#1003 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Hi Mark,
Yes, it's a SK129, select preferred height depending upon required degs/watt and ambient temp.
cheers,
Andrew
Yes, it's a SK129, select preferred height depending upon required degs/watt and ambient temp.
cheers,
Andrew
Analogue, the lost world that lies between 0 and 1.
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#1004 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Ooh, the stuff's coming in now - parcel heaven
I see Farnell prioritised the C0G caps, I put them on the DHT boards this evening.
I see Farnell prioritised the C0G caps, I put them on the DHT boards this evening.
"Once you find out ... the Circumstances ; then you can go out"
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#1005 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
What are the IXYS rectifiers Andrew ?
I've just been double checking what goes where, but feeding in the codes on the IXYS parts I can't come up with a match .
I'll need a few more further down the line, not right now.
I've just been double checking what goes where, but feeding in the codes on the IXYS parts I can't come up with a match .
I'll need a few more further down the line, not right now.
"Once you find out ... the Circumstances ; then you can go out"