Vunce, X,
I bought a bunch(10) of the cpu coolers when I thought I was going to build an arsenal of Class A amps. I only have the AN, VSQA, and maybe the ACA (JPS pcb) left to build for Class A.
I am assuming one cooler per channel for each of the amps above (based on 100W dissipation) for a rough estimation, which would leave me with 4 coolers left. I would like to try a couple on shaan's V4H amp, which would leave me with 2 coolers either for the Xmas amp or an extra 2 if needed on the Nirvana.
With the AN and the VSQA, I may just keep the ACA pcbs in storage for a rainy day or sell them, as they may not be needed.
Anyways, good to hear that they could be used.
MM
I bought a bunch(10) of the cpu coolers when I thought I was going to build an arsenal of Class A amps. I only have the AN, VSQA, and maybe the ACA (JPS pcb) left to build for Class A.
I am assuming one cooler per channel for each of the amps above (based on 100W dissipation) for a rough estimation, which would leave me with 4 coolers left. I would like to try a couple on shaan's V4H amp, which would leave me with 2 coolers either for the Xmas amp or an extra 2 if needed on the Nirvana.
With the AN and the VSQA, I may just keep the ACA pcbs in storage for a rainy day or sell them, as they may not be needed.
Anyways, good to hear that they could be used.
MM
We should create a waiting list in case some folks in the original list don’t follow through with shipping charges etc.
I would do more but packing these and making mail labels and collecting funds is a lot of work. 25 packages is about 3 hours of work minimum to pack and ship. You guys are welcome to make your own giveaway if anyone is up to doing it.
Xmas Amp Giveaway list:
Waiting List:
I would do more but packing these and making mail labels and collecting funds is a lot of work. 25 packages is about 3 hours of work minimum to pack and ship. You guys are welcome to make your own giveaway if anyone is up to doing it.
Xmas Amp Giveaway list:
Waiting List:
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Thanks a lot X.
Your enclosure link has heatsinks (250x40x120) of 0.45 C/W per channel so awesome.
BR,
Eric
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I Guerilla am bailing out, so I guess my two boards should go to 1883. I shouldnt learn more electronics before Ive sold of my many surplus hifi devices. My wife would agree, and I really want to keep her too. Thank you for the generous gift-offer. If I will need a 100watts amp. I will try to find it in swapmeet. I wish you all continuesly happy holidays.
Cheers!
Cheers!
I’ve decided to bow out of this as well. While it would be interesting to compare to the Mauro Penesa LM3886 amp of somewhat similar design, my free time and funds are fairly limited. So I’ve decided to stay focused on my main goal of building a very nice SE Class A amp of Pass lineage, and also maybe play around with some tubes...after finishing my other projects that are currently in progress.
Thanks again though to x, jhofland, and dibya. I very much appreciate the offer.
I believe this leaves 1 pair of Xmas amp boards up for grabs.
Thanks again though to x, jhofland, and dibya. I very much appreciate the offer.
I believe this leaves 1 pair of Xmas amp boards up for grabs.
Merry Christmas every one
since its a TDA7293 post may i ask for why i cant get a full power from that CHIP?
im using a trasnformer 24-0-24and 3300uF capacitors at power supply and wiring is identical to datasheet
i get a low volume when i measure its AC voltage amplitude it turned to be from 6 to 10 volt AC and even other family chips TDA7296 , TDA7295 ,TDA7294 ..... the sound is clear and good but volume doesnt seem to be even 25w ?
btw i tested a 8R speaker and 4R speaker it didnt differ a lot ...is this a fake CHIP?
help plelase
since its a TDA7293 post may i ask for why i cant get a full power from that CHIP?
im using a trasnformer 24-0-24and 3300uF capacitors at power supply and wiring is identical to datasheet
i get a low volume when i measure its AC voltage amplitude it turned to be from 6 to 10 volt AC and even other family chips TDA7296 , TDA7295 ,TDA7294 ..... the sound is clear and good but volume doesnt seem to be even 25w ?
btw i tested a 8R speaker and 4R speaker it didnt differ a lot ...is this a fake CHIP?
help plelase
@Vindiesel: Sorry I can’t answer your question. I’ll let you know once mine is built.
Hi Folks, Happy New Year!
Vunce made great progress on the verification build. It’s all powered up and the new zener diode HV supply mod is working perfectly. We are running into something with the DC offset servo though as it’s not hitting 0mV (offset at 41mV). So we are debugging that.
I expect first sound soon though, 41mV DC offset, notwithstanding.
Hi Folks, Happy New Year!
Vunce made great progress on the verification build. It’s all powered up and the new zener diode HV supply mod is working perfectly. We are running into something with the DC offset servo though as it’s not hitting 0mV (offset at 41mV). So we are debugging that.
I expect first sound soon though, 41mV DC offset, notwithstanding.
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Thanks for the update - good progress but shouldn't Vunce have his feet up with a beer! Happy New Year,
I wanted to add this info,
The TDA7293 chip is mounted on a 140mm x 65mm x 40mm heatsink with a ceramic TO-264 insulator between. After an hour of playing music at a moderate level, (just loud enough to still be able to talk to another person in the room), the heatsink temperature is 35°C (ambient temp 21°C) with a +/-36v psu. After a run of several Class A amplifiers this is barely warm
The TDA7293 chip is mounted on a 140mm x 65mm x 40mm heatsink with a ceramic TO-264 insulator between. After an hour of playing music at a moderate level, (just loud enough to still be able to talk to another person in the room), the heatsink temperature is 35°C (ambient temp 21°C) with a +/-36v psu. After a run of several Class A amplifiers this is barely warm
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Hi Vunce, Thanks for building the verification build.
I think your speakers are 8ohms , on 4 ohms it's nice room heater in winter.
Nevertheless , it's produces much less heat than lm3886 due efficient DMOS stage.
Of course my vintage Philips speakers are 82db/w/m on top of being 6ohms. (All hail inefficiency).
I think your speakers are 8ohms , on 4 ohms it's nice room heater in winter.
Nevertheless , it's produces much less heat than lm3886 due efficient DMOS stage.
Of course my vintage Philips speakers are 82db/w/m on top of being 6ohms. (All hail inefficiency).
Vunce, you have a problem. 😀 Better keep a fire extinguisher at hand while listening. Where did you get those TDA chips?
