I will (always) use a PowerReg, from Teddy Pardo. It also saves on caps.
Introducing the PowerReg - pink fish media
Cheers,
M
Delite with 2 light bulb
I just wire up Delite Amp on a piece of plywood. The power supply voltage is DC 64V. Two light blub per channel (parallel). One of the light blub is 110V 200W, the other light blub is 240V 500W. The sound is warm, better than my zenlite.
I just wire up Delite Amp on a piece of plywood. The power supply voltage is DC 64V. Two light blub per channel (parallel). One of the light blub is 110V 200W, the other light blub is 240V 500W. The sound is warm, better than my zenlite.
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Nelson's ZV3 article is THE article. I learned a lot from this tutorial and applied it in the amp I took to BAF 09. The article also points out how to modulate the voltage supply to augment the output. I discovered that with my amp (balanced choke loaded follower), the output (low voltage) was severely limited by the regulated supply voltage (also low voltage). By modulating the voltage regulator, I was able to swing higher output voltages without bumping into the regulated +V barrier (which is lower than the raw +V supply--wouldn't want to confuse the two). All this can be yours by reading ZV3, my hitchhiking friend. 😀
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This looks very interesting!
Just reviewed domestic suppliers- I can get only 21N50 or 24N50. It seems that these can also be used in this scheme ?
P.s. Tonywong - nice amp 🙄
Just reviewed domestic suppliers- I can get only 21N50 or 24N50. It seems that these can also be used in this scheme ?
P.s. Tonywong - nice amp 🙄
To John the Carpenter, Heavy Amp builder
Carpenter, I have read that a few times lately, letting it slowly try to absorb into my mind. I built a few variations of the V9 chunk Vix sent me and the first on on the V3, powers up nice and slowly to full voltage, however, when I hook it up to an output cap, it's nadda current. I need to play with this a bit more, and re-read.
What I don't want to do with this amp is make a really complicated power supply, as I think it would discourage some newbee's from thinking it's needed. Of course I think Nelson is really the man to disseminate that message.
Work's been crazy in my world, where vacation times mean technology changes occur behind the scenes..Need to be alert when plating with electicity.😱😱
Carpenter, I have read that a few times lately, letting it slowly try to absorb into my mind. I built a few variations of the V9 chunk Vix sent me and the first on on the V3, powers up nice and slowly to full voltage, however, when I hook it up to an output cap, it's nadda current. I need to play with this a bit more, and re-read.
What I don't want to do with this amp is make a really complicated power supply, as I think it would discourage some newbee's from thinking it's needed. Of course I think Nelson is really the man to disseminate that message.
Work's been crazy in my world, where vacation times mean technology changes occur behind the scenes..Need to be alert when plating with electicity.😱😱
I hate outputs caps--guess that's why I go the balanced route...and you should stop taking such long vacations! 😀
Oh man, my post made no sense.
I've been busy with work with all these Info Tech customers doing hardware/software transitions during the holidays. I dont usually take long vacations, just lots of small ones.
Also, although the De-Lite has an output cap, I meant to say that the little reg I built similiar to the first one in ZenV3 creates voltage, unless connected to the amp, then no current. So I did something wrong. I conntected the little reg side cap (not charger) to a channel of the amp, and then measures no juice. I need to look at it again. I usually walk away and work on something else when I get stumped. Then start reviewing articles, data and importantly - wiring. Of course maybe the reg just doesn't like lightbulbs.😛
I am glad a few of you are enjoying your D-Fets.
If I remember correctly, you're supposed to be pulling voltage and current from the source pin of the regulator mosfet. Is this what you're doing?
I'm hoping to have a go at this. Would some 18-0-18 transformers wired in series (ie 36V) at 300VA be good enough for each channel?
Secondly, the lamps.... 240V ones will draw half the current (am I right in this?) so I would need roughly 2x the wattage compared to papas knock up at BAF?
Fran
Secondly, the lamps.... 240V ones will draw half the current (am I right in this?) so I would need roughly 2x the wattage compared to papas knock up at BAF?
Fran
Woodturner, all you have to do is forget that your transformer has a center tap and
not use it and you have a 36v transformer. Or you could use the center tap and build a + and - 24v supply but in this case leave the center tap and it's conection
to the 2 caps floating and ground the -24v output you get 48v this way and can use
35v caps for this first filter bank.
not use it and you have a 36v transformer. Or you could use the center tap and build a + and - 24v supply but in this case leave the center tap and it's conection
to the 2 caps floating and ground the -24v output you get 48v this way and can use
35v caps for this first filter bank.
Thanks, ill be trying it later.
For those in 240v countries I have done some simple measurements on a range of lamps. 60w lamps measure about 90r. 100w comes in at 40r. 150w halogen stick type was 30r. Lastly I measured a few 500w halogen sticks which varied from 12r to 19r. So it would seem 2 in parallel to give 250w or so is a sensible Target.
Fran
For those in 240v countries I have done some simple measurements on a range of lamps. 60w lamps measure about 90r. 100w comes in at 40r. 150w halogen stick type was 30r. Lastly I measured a few 500w halogen sticks which varied from 12r to 19r. So it would seem 2 in parallel to give 250w or so is a sensible Target.
Fran
I believe Nelson said that you could combine current sources. So if you can't find
the proper light bulb use something lower warrage and a resisror or ccs in paralle with it to give the proper load.
the proper light bulb use something lower warrage and a resisror or ccs in paralle with it to give the proper load.
Hi Tea-bag,
Have you got it done?
Any impression compare to other First watt clone you have done?
Nope, I am trying a modified Salas Reg now, but still need some parts.
Impressions on sound. It does not sound very similiar to other first watt's I've heard IMO.
F2-F5.
Maybe it sounds a bit like an F2. It's dynamic with a vigor or energetic feel to me. Not too refined as say F3 and F5. I think the distortions add some good flavor to it, and it's a nice sounding FET as well. Just opinions. Power Supply in CRC mode was important to me to get the noise down to low levels. I look forward to seeing what this reg can do.
Impressions on sound. It does not sound very similiar to other first watt's I've heard IMO.
F2-F5.
Maybe it sounds a bit like an F2. It's dynamic with a vigor or energetic feel to me. Not too refined as say F3 and F5. I think the distortions add some good flavor to it, and it's a nice sounding FET as well. Just opinions. Power Supply in CRC mode was important to me to get the noise down to low levels. I look forward to seeing what this reg can do.
