Re: My Cute AMPCAMP Build started
Superb looking amp. How I wish it could be bridged to get more power!!
Superb looking amp. How I wish it could be bridged to get more power!!
My Cute AMPCAMP Built
- Thread starter nraghunadh
- Start date
Re: My Cute AMPCAMP Build started
Yes Captain, even I am waiting for the same. But when I had a discussion with nraghunath sometime back it seems that somebody on the diy audio forum had actually made mono amps by bridging with 10W each per channel. This would be great if somebody gives a try as I am a novice in this
Yes Captain, even I am waiting for the same. But when I had a discussion with nraghunath sometime back it seems that somebody on the diy audio forum had actually made mono amps by bridging with 10W each per channel. This would be great if somebody gives a try as I am a novice in this
That is easily possible, but I have a question. In that case we take speaker outputs from two hot terminals of both PCBs which has those big electrolytic capacitor in series. So speaker live will have one capacitor and GND will have another in series. How good it could be wrt directly coupled amp? Is that worth - considered this is quite nice loud amp. I am using this with GR Research BS speakers in 12X12 feet bedroom.
Om, not sure how this turns out or sounds but my ACA is not able to power my DIY Zaph speakers as they are 86db I think but drives my Frugal Horn beautifully with the knob at 10 o'clock position.
Hmm. Let me get my speaker cabinets ready and I'll try out various options. Since I'd be using an active xover, I would need 4 channels of amplification.
sachu888
Well-Known Member
Added Height adjustable footers. They are actually glass studs,available at hardware stores
Regards
Sachin
Regards
Sachin
sachu888
Well-Known Member
Actually I bought 4th one wrong size,so I placed three.I have bought correct one while returning from office,today.Now it sits on four legs
Regards,
Sachin
Thad E Ginathom
Well-Known Member
Why on earth would you want to adjust the height?
But hey, never mind... it looks good!
But hey, never mind... it looks good!
sachu888
Well-Known Member
Why on earth would you want to adjust the height?
But hey, never mind... it looks good!
That's true,height adjustment is not needed here,but footers are necessary for proper air circulation. Its class A and does get very hot without feet.
Regards,
Sachin
Thad E Ginathom
Well-Known Member
Oh yes... air circulation is good!
Today I again returned back to my 2.2K resistor mod , and it sounds good. But it's hotter to scare enough. I am willing to bet on IRFP240 this time. Listening last 4 hrs, it's sounding to ears like fluids.
Ref. http://www.hifivision.com/diy/47193-my-cute-ampcamp-built-6.html#post552659
Ref. http://www.hifivision.com/diy/47193-my-cute-ampcamp-built-6.html#post552659
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I completed my AMPCAMP + DCB1 + OPS last week :yahoo:.
Thanks sachu888 and omishra for the kits and nraghunadh for the really nice cabinet and hardware. I had wanted to build a Class A amp, looked at a few tube designs, found them bit complicated and not really suited for my setup. Finally I stumbled upon this thread and found this to be perfect for my purposes. The fact that I could get all the parts in one kit here in India was a very happy surprise, kudos to this forum. The amp cabinet is really cute and well made. :clapping: This forum is turning out to be DIY heaven for Indian DIY'ers. Keep up the good work! :cheers:
I needed a preamp to go with the ACA. I have the SPP which I built earlier but it is now part of my Norge 2060, so I decided upon B1. Then Sachin pointed out the DCB1 which builds upon the B1 and improves upon it. So I got the DCB1 kit and OPS to power it up. :licklips:
The offset, biases wete all tested and set up, and then I hooked it up to my source (HTPC+ODAC). First thing I noticed that there is absolutely no hum, buzz etc. - what they call a "black background". Awesome!hyeah:
The first track I played was Gulon Mein Rang Bhare from Haider (just mp3). The sound, the clarity, the soundstage was amazing!. Could not believe I built this! :yahoo: But the bass was bit boomy and all over the place. And the volume was also bit low - I had to really crank it up to get decent output. I thought it needed a bit of burning in, so I ran it for 24 hrs yesterday.
Now the bass is much improved, sound has improved further and the volume I can live with (I am using Aviano 2). Spent one whole hour just listening to music flowing from the speakers. The best part are the string instruments - the guitar has so much more realism now! Absolutely love it! The cymbals and high hats souund great. Soundstage is awesome. The SSP+Norge combo was good, but DCB1+ACA takes it further. And the best part is that I built it myselfhyeah:.
Great to be a part of this forum!
Thanks sachu888 and omishra for the kits and nraghunadh for the really nice cabinet and hardware. I had wanted to build a Class A amp, looked at a few tube designs, found them bit complicated and not really suited for my setup. Finally I stumbled upon this thread and found this to be perfect for my purposes. The fact that I could get all the parts in one kit here in India was a very happy surprise, kudos to this forum. The amp cabinet is really cute and well made. :clapping: This forum is turning out to be DIY heaven for Indian DIY'ers. Keep up the good work! :cheers:
I needed a preamp to go with the ACA. I have the SPP which I built earlier but it is now part of my Norge 2060, so I decided upon B1. Then Sachin pointed out the DCB1 which builds upon the B1 and improves upon it. So I got the DCB1 kit and OPS to power it up. :licklips:
The offset, biases wete all tested and set up, and then I hooked it up to my source (HTPC+ODAC). First thing I noticed that there is absolutely no hum, buzz etc. - what they call a "black background". Awesome!
hyeah:The first track I played was Gulon Mein Rang Bhare from Haider (just mp3). The sound, the clarity, the soundstage was amazing!. Could not believe I built this! :yahoo: But the bass was bit boomy and all over the place. And the volume was also bit low - I had to really crank it up to get decent output. I thought it needed a bit of burning in, so I ran it for 24 hrs yesterday.
Now the bass is much improved, sound has improved further and the volume I can live with (I am using Aviano 2). Spent one whole hour just listening to music flowing from the speakers. The best part are the string instruments - the guitar has so much more realism now! Absolutely love it! The cymbals and high hats souund great. Soundstage is awesome. The SSP+Norge combo was good, but DCB1+ACA takes it further. And the best part is that I built it myself
hyeah:.Great to be a part of this forum!
Congratulations, nice build.
One more thing I found. When we are using only DCB1 on 10V, supplied r-core is 22-0-22, (which meant for previous B1 24V case) is overkill. If possible then replace R1, R2 (those big 1R resistances) on OPS with 500 ohm, 2W. This will reduce input voltage to regulators at 20mA current case by 10V making it run cooler. Input to regulators is 33V with 22-0-22 r-core. It could be 250ohm,2W for double DCB1 case.
Other way to use 12-0-12 r-core with stock parts.
Recalibrate output voltage after replacing transformer or resistances.
One more thing I found. When we are using only DCB1 on 10V, supplied r-core is 22-0-22, (which meant for previous B1 24V case) is overkill. If possible then replace R1, R2 (those big 1R resistances) on OPS with 500 ohm, 2W. This will reduce input voltage to regulators at 20mA current case by 10V making it run cooler. Input to regulators is 33V with 22-0-22 r-core. It could be 250ohm,2W for double DCB1 case.
Other way to use 12-0-12 r-core with stock parts.
Recalibrate output voltage after replacing transformer or resistances.
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sachu888
Well-Known Member
Re: My Cute AMPCAMP Build started
Very nice build. Black aca cab is looking real good. MS Aviano are little hard to drive. It would be good if you use high efficiency speakers with ACA. You can also add SSP in to DCB1 input for additional gain.
As Omishra suggested, replace those three power resisters in Ops. I have also noticed that my regulators run very hot after adding DCB1
Regards
Sachin
Very nice build. Black aca cab is looking real good. MS Aviano are little hard to drive. It would be good if you use high efficiency speakers with ACA. You can also add SSP in to DCB1 input for additional gain.
As Omishra suggested, replace those three power resisters in Ops. I have also noticed that my regulators run very hot after adding DCB1
Regards
Sachin
indialogue
Active Member
Don't know if this has already been asked/discussed here but has anyone run the AmpCamp with a LPS instead of a laptop power supply? Is it worth the additional expense in your opinion? If yes, some insight into your build please!
keith_correa
Well-Known Member
If you see shanindia's pic's you will notice a R-Core transformer. That should answer your Q.
indialogue
Active Member
I think that powers the preamp alone? I might be wrong
sachu888
Well-Known Member
Re: My Cute AMPCAMP Build started
Hi Keith
Shan is running his DCB1 from preamp and ACA with Laptop power supply.
Few people at divaudio are running ACA with proper power supply. They didn't notice any improvements over laptop brick.
The best mod is 2.2k resister mod to get 6 W from ACA. It gives little additional gain and also very less distortion.
Regards
Sachin
Hi Keith
Shan is running his DCB1 from preamp and ACA with Laptop power supply.
Few people at divaudio are running ACA with proper power supply. They didn't notice any improvements over laptop brick.
The best mod is 2.2k resister mod to get 6 W from ACA. It gives little additional gain and also very less distortion.
Regards
Sachin
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