DHT Heater using VCCS - PCB or Kit (Possible Group buy)
- IslandPink
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#46
They are quite low - 4.2V at 0.325A
( Also centre-tapped so you can run them at 2.1V @ 0.65A )
( Also centre-tapped so you can run them at 2.1V @ 0.65A )
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- IslandPink
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#47
Ready and waiting, Andrew
http://www.audio-talk.co.uk/phpBB2/view ... &start=150
http://www.audio-talk.co.uk/phpBB2/view ... &start=150
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#49
Yes....Saturday ... do you feel a prototype coming on ?
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#50
Well I was thinking I might be ale to bring soemthing down. Could be just some raw PCB for you to build up, could be something to try on the day, dunno what suits best?
Andrew
Andrew
Analogue, the lost world that lies between 0 and 1.
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#51
OK - I don't want to force you into making a PCB prematurely .
In that case trying something (prototype) on the day makes most sense.
It will however be hard to judge in that kind of environment on the Saturday .
If you already have some PCBs, then I would take one away and try out in more suitable circumstances.
Does that make sense ?
ps. For info, I'm feeding your V-reg ones from 6V toroid : most likely 7V AC ; for 4.0 V out ( sufficient ) .
In that case trying something (prototype) on the day makes most sense.
It will however be hard to judge in that kind of environment on the Saturday .
If you already have some PCBs, then I would take one away and try out in more suitable circumstances.
Does that make sense ?
ps. For info, I'm feeding your V-reg ones from 6V toroid : most likely 7V AC ; for 4.0 V out ( sufficient ) .
"Once you find out ... the Circumstances ; then you can go out"
#52
OK, I have one built that is as final as it's going to be at this stage, I'll bring it down for you to try, either on the day and/or to borrow for feedback.
Here's the spectrum on the 200mV scale, temp of the heatsink reads 45 degrees C above ambient for 5V in 3.7R, so 1.35A.
It will need to be set for whatever voltage you need; its just a resistor change.
cheers,
Andrew
Here's the spectrum on the 200mV scale, temp of the heatsink reads 45 degrees C above ambient for 5V in 3.7R, so 1.35A.
It will need to be set for whatever voltage you need; its just a resistor change.
cheers,
Andrew
Analogue, the lost world that lies between 0 and 1.
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#53
That looks excellent .
If you could adjust it to give something from 4.0 to 4.2 volts before Owston, that would be great . Also if you can give it a few hours steady running so the caps can form-up that would be good, although of course it should be less of an effect on this high-z source than on the voltage-regulated ones . I could hear a distinct improvement in the driver board I've just made, in 3-4 hours, which I attributed to a combination of the 4P1L's warming up, and the filament supply caps forming - not sure which was most significant in that . There wasn't much else that had to run-in .
Edit : just worth asking that I can get a clean 4.2V DC out if I feed it with ~7V AC in, is that OK ?
If you could adjust it to give something from 4.0 to 4.2 volts before Owston, that would be great . Also if you can give it a few hours steady running so the caps can form-up that would be good, although of course it should be less of an effect on this high-z source than on the voltage-regulated ones . I could hear a distinct improvement in the driver board I've just made, in 3-4 hours, which I attributed to a combination of the 4P1L's warming up, and the filament supply caps forming - not sure which was most significant in that . There wasn't much else that had to run-in .
Edit : just worth asking that I can get a clean 4.2V DC out if I feed it with ~7V AC in, is that OK ?
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#56
Excellent !
Can somebody bring a soldering iron, please ?
Can somebody bring a soldering iron, please ?
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#58
Oh yes !
If there's one of the new boards, it ought to be possible to have it running at some stage with one V-reg board and one I-reg board, and if I bring a good mono record, we can compare the sound quickly by adjusting the volume pots ( two ) on the left and right channels .
If there's one of the new boards, it ought to be possible to have it running at some stage with one V-reg board and one I-reg board, and if I bring a good mono record, we can compare the sound quickly by adjusting the volume pots ( two ) on the left and right channels .
"Once you find out ... the Circumstances ; then you can go out"
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#60
Got the DHT supply in place and had about an hour listening so far, Andrew .
Just one ( left ) channel, obviously .
It does seem to fill out the upper bass tone , so far.
The Stranglers sounded good !
Not sure if I've lost something, but I'll update you in the next day or two how it goes as I do more running/listening .
Just one ( left ) channel, obviously .
It does seem to fill out the upper bass tone , so far.
The Stranglers sounded good !
Not sure if I've lost something, but I'll update you in the next day or two how it goes as I do more running/listening .
"Once you find out ... the Circumstances ; then you can go out"