Quote: Hi again,   I finally found out the source of my problem, it turned out that I pulled too much current from the PSU (DACT CT-102). The power supply is rated at max +/- 200 mA, but when I measured the current going through my PPA V2 using my bench PSU I only measured 150 mA when...

Well, they didn't get hot, just sligthly warm.

OK, so I have a problem. I turned on the amp today, and I measured 15 V at the left- and ground channel, luckily I didn't plug my headphones in. I suspected that the Q3's were fried, and so it turned out. I simply replaced them and everything was ok. I measured under 10 mV at each channel.  ...

Quote: They sound excellent!

  Quote:   OK, I'll try measuring the current through the amp.  

My PPA V2    Here are the pictures:     I have more pictures of my PPA V2 on Photobucket, just follow this link: http://s789.photobucket.com/albums/yy179/vgjako/PPA%20V2/   I have only used high-end components on this amp, listed below is the parts used: - DACT CT-102 Audio...

I just finished building this amp yesterday, and I knew from various reviews that the amp would be good, but not this GOOD!   Listening Impressions: The first thing I noticed was the separation of the instruments, I was listening to Telegraph Road by Dire Straits and heard many “new”...

I managed to find both transistors on ebay, so now I am almost ready to start assembling my PPA V2.

Quote: Farnell only do business with companie's, they don't take credit card's. The only thing I could do is to order the parts through my school.   Quote: You don't have any PN4392's?

I have trouble sourcing parts, so I was wondering if anyone had some PN4392's laying around, I will need at least nine of them, more would be better. I also need the output transistors, MJE243 and MJE253, I need at least 3 of each. I can pay via PayPal.

Hi,   I have drawn a schematic which shows how I think it should be done:     As you can see, I am running the ground lead to the ground plane. I am measuring 30 V from + to ground, everything seams to be working well. Wouldn't this configuration be correct, isn't this what you...

One last question: Am I supposed to leave the TLE positions open or jumper them? I would guess I should leave them open, because if I jumper them it would mean that VH+ and VH- will be connected to ground, am I correct?

Ok, I get you. Thanks for taking the time to explain it to me.

In Tangent's guide it says: "If you have a dual-voltage power supply, it's probably better to run the amp from the outer terminals and ignore the ground lead than to try and hook up the ground lead"   Doesen't this mean that i can do what I asked about above?   If I understand...

So, can I connect the + connector on my PSU to V+ on the PPA, and the - connector to V- on the PPA and just ignore the G connector on my PSU?

I have a dual-power supply which I am going to use to power my PPA V2. The power supply has three connections, +, - and G (Ground). So my question is: Can I use the + and - connections on my power supply to power the PPA V2, this gives me +/- 15 V. Or would I have to use + and G?   Thanks

Is there a formula for calculating the buffer bias? I am going to use a 3,3 ohm resistor for R24 and R34, I want 30 mA of buffering. What will R12 be?   Thanks

I can recommend you checking out this site:http://www.humblehomemadehifi.com/index.html   It contains a lot of information about loudspeaker designs, and various designs made by Tony Gee from the Netherlands. Good luck with your DIY'ing.   Regards vgjako

I would personally choose to build a Pimeta V2 rather than a Cmoy if you are going to add a diamond buffer to the Cmoy. The Pimeta is a better amp then the Cmoy and will serve your headphones better than a Cmoy. You can get the circuit board for the Pimeta V2 from tangent's...

Quote:     Thanks mudgecoffe, that really cleared a lot of things up for me. So the higher the cap value, the less noise you get.     What gain do you think I should be running on, 3, 4, 5...? I will use the Burson Audio HD Op-amp (single) which is unity gain stable. I would guess...

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Hi again,   I once again have a question, the standard configuration of C5 on the PPA V2 uses a 1 uF capacitor, this gives a corner frequency of 16 kHz. I've would guess that a lower corner frequency is better, say I use a 2,2 uF capacitor instead of 1 uF, this will give me a corner...

Hi again   I have a few questions listed below: 1. What is the highest voltage I can use on OPA637/27 op-amps? The datasheet says plus-minus 18 V, can I use lets say 24 V? If not, what would you suggest as an appropriate voltage level? 2. Is the resistor R4G supposed to be the same value...

I haven't been able to find a datasheet of the Burson Audio op-amp, so I haven't any good reason to choose this op-amp. The specs I have found on this op-amp is:   Working voltage: +/-12-25v DC Current Draw: 19mA (each module) THD: Less than 0.0007% Dimensions: 39mm × 10mm × 29mm...

Hi   I was wondering if somebody has tried the Burson Audio Single & Dual Op-amps in their PPA? It would be interesting to hear how they compare to lets say a AD8610, or a OPA627/37. I am planning to build a PPA V2, so it would be nice to know if they will function in the PPA V2 design. I...