mexakin, thanks for the good find. I haven't finished my boards yet but I do have Q1 and Q2 with wrong transistors installed, so you are not the only one. Are your boards working now without any other damage?
I have not tested it at that voltage. The input transistors will run very close to their maximum allowable VCE. So I think it may not be very safe.
Yes, i tried that yesterday. Started with 45VDC to trim the amp in, then changed to 60VDC (59,4V actually). Current I got per three stages are:
1,8mA, 11mA, 33mA. Trimpot was changed to 10K instead of 2K2.
By the way i went up from 45VDC to 60VDC just of curiosity and after all was powered up i found out that Panasonic FC cap i used were rated for 50V DC. And they survived. Me too! 🙂
After many tries and ideas, my PCB looks pretty much the same as the one you can find here on DIYAudio, just with some modifications.
I plan to use 45VDC for my own version. 60V is a bit extreme i think 🙂
Now i wonder, who is the author of the version V2.0? I plan to publish a circuit diagram on my own little website, so i want to name the author also.
Hats off!
I think it was me who designed and published the V2.
Thanks for sharing your test results. 🙂
Ok, thanks, thats what i thought, just wanted to be sure. And now the ones who did not knew - knows 🙂
How do i increase the mosfet current? I tried adding another diode, so Mosfets got 200mA each, at +-45V DC. so the dissipation was a bit high. I guess it will get unstable if i place a resistor instead of a diode.
Another thing, i dont get more that 32V RMS at the output with 8 ohms load.with 1KHz sinewave., with +-57V DC PSU, so its about 130W, not 160W. How much did others that built version 2.0 got?
Thanks.
Another thing, i dont get more that 32V RMS at the output with 8 ohms load.with 1KHz sinewave., with +-57V DC PSU, so its about 130W, not 160W. How much did others that built version 2.0 got?
Thanks.
You can use a 500R trimmer in series with the existing diode or replace the diode with the trimmer. To do this you need to short the trimmer's pin 2 and 3, then turn it to zero resistance between pin 1 and 3 and place it in series with the diode or remove the diodes and use the trimmer alone to bias the FETs.
Rail sag under load can cause this. More sag in the rails - more sag in the output.
And i thought i used a powerful transformer. At max power with sine wave, it went from 57V down to 50V. Incredible 🙂 Well, will go even bigger with power supply then. Amplifier is worth it. Sound very good. Thanks for a nice amp shaan!
Here is my version of a high power PeeCeeBee V2.0 boards. Those are double sided (so let me know if I posted at a wrong thread). Professionally traced, with a touch of love and energy:
This high power version is a very good sounding amplifier, very easy to trim in and to solder. I added additional pin terminals for easier measuring of currents, Panasonic FC caps, an additional resistor with a jumper connector to use with a bit higher MOSFET current if wanted. No PCB traces on the board under MOSFETS to minimize the abrasion of traces and to minimize/equalize traces temperature. Small details as said 🙂 1,6mm thick board makes no need of extra standoffs to hold the board. It rests only on MOSFETS. Input pin is a solder pad. It makes it easier to solder the input wires when the board is already mounted on heatsink. A place for a srew terminal connector for power supply. It does not stress the board when changing the wires compared with those hook on connectors.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
This high power version is a very good sounding amplifier, very easy to trim in and to solder. I added additional pin terminals for easier measuring of currents, Panasonic FC caps, an additional resistor with a jumper connector to use with a bit higher MOSFET current if wanted. No PCB traces on the board under MOSFETS to minimize the abrasion of traces and to minimize/equalize traces temperature. Small details as said 🙂 1,6mm thick board makes no need of extra standoffs to hold the board. It rests only on MOSFETS. Input pin is a solder pad. It makes it easier to solder the input wires when the board is already mounted on heatsink. A place for a srew terminal connector for power supply. It does not stress the board when changing the wires compared with those hook on connectors.
And here is my version of PCB version of PeeCeeBee V4.0. I have not compared V4.0 with other amps yet. Planning on doing that very soon. V2.0 will meet V4.0.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Awesome job! Both look very beautiful I must say.
Don't worry none's gonna sue you for it, we're past those days so feel free to share any and all PeeCeeBee ideas in this thread. As always we'll be waiting for the PDFs.
🙂
Hi Shaan,
After successfully assembling two channels Peeceebee V4 (thanks again Shaan for the excellent boards), I am contemplating the idea of building the 4 outputs version. Will there be a GB for these new boards?
Cheers,
Jacques
After successfully assembling two channels Peeceebee V4 (thanks again Shaan for the excellent boards), I am contemplating the idea of building the 4 outputs version. Will there be a GB for these new boards?
Cheers,
Jacques
Yes there will be, along with the new PSU with speaker protection. 🙂
p.s. Take a look: HFV Post 183 😉
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When will we see the schematic with parts values of High Power V4.0? I would love to built it as well and compare together with other versions. Or will it be a commercial verion? Thanks.
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