Merely illustrating that amplifiers with horizontal heatsink fins can be rather pretty.
The one in the image I posted is a serial manufacture example of nearly 3 decades ago, could be ordered with red heatsinks (2 x 60W MOSFET amp)
Pretty looks or strictly efficient, tough choice in the playground
(https://www.youtube.com/watch?v=MO3_NTwFuj8)
The one in the image I posted is a serial manufacture example of nearly 3 decades ago, could be ordered with red heatsinks (2 x 60W MOSFET amp)
Pretty looks or strictly efficient, tough choice in the playground
(https://www.youtube.com/watch?v=MO3_NTwFuj8)
Hi what Rigol scope you using. I'm thinking of getting the cheap Rigol 1054Z any other suggestions ?
I have 1074Z which is exacly the same, You can hack it easly to full version, the main diffrence is software. It is good enough for the money.
You like that "supercharged" harmon kardon OPS , huh ! I see you made
a "baby" CFA (X).
There are a lot of those out there (maybe as many as vssa ??) 😀
PS - see the nice overload behavior - "kypton C"(cfa) has almost "rounded"
better clipping - like a valve.
I don't play around !
OS
Thanks OS
I really like it !!
It is saving a lot of time, really massive amout time is saved with this aproach. I will have to fine tune the temp compensation (which is working really quick !!). I have used predrivers with hfe around 280, sanken drivers hfe=300 and NJW0xxx with hfe=110 so the current gain is massive.
Mr Self magic resistor is working fine too.
I have made IPS from my last small project (I like it a lot).
Now I am preparing CFP OPS with 2 pairs of outputs, I do not know and can not explain why but it was sounding very very good with CFP output (with 20mA bias only).
THX
Peter
I really like it !!
It is saving a lot of time, really massive amout time is saved with this aproach. I will have to fine tune the temp compensation (which is working really quick !!). I have used predrivers with hfe around 280, sanken drivers hfe=300 and NJW0xxx with hfe=110 so the current gain is massive.
Mr Self magic resistor is working fine too.
I have made IPS from my last small project (I like it a lot).
Now I am preparing CFP OPS with 2 pairs of outputs, I do not know and can not explain why but it was sounding very very good with CFP output (with 20mA bias only).
THX
Peter
Attachments
Last edited:
Of course, old AB class power amplifier 200W rms 8ohm, 6 output stage bipolar transistors, overdimensioned power supply and MJ15024 power output stage,...
Thanks.
I haven't made the board yet, I hope by the end of the week I will know.
With my previous CFP-Mad amp I have used 22pF, I think that 10pF would be sufficent enough, the config was 2sc5200/2sa1943 and drivers were bd139/140 -16. With 22pF it was rock stable.
In the new board I have made a room for degeneration resistors in CFP stage so it should help a bit.
Last edited:
Hi 2011diy,
Is it based off an existing design? If yes, which one is it? If not, could you tell us more about it? Balanced?
Thanks
Do
HI！THE PCB is designED BY MYSELF ；This is the reference circuit design of Germany。NO Balanced！😀
Discrete series regulators with a differential pair error amp powering
a standard "blowtorch" type differential class A line stage.
Trimmers on the line stage for balancing the input pairs and a trimmer
on the regulator for voltage adjustment.
OS
Gentlemen, I would like and show you a picture of my current SYMASYM-build.
Most of the parts that you can see on the attached pictures are "DIYed".
The case has been built by my carpenter-friend Gerhard.
The SYMASYM-integrated-amplifier consists of:
- two DUAL-Mono SYMASYM Black (Green!) - Beauty SYMASYM-PCBs
- Mains Schaffner-filter being followed by a mains-DC-filter and Soft-Power-On
- 4 x 25 VAC torroid transformer rated at 400VAC
- My VCPRe (doing the source selection, attenuation (via LDRs), .....)
- Every functionality can be controlled via a IRC - unit
This build is using the small SANKEN TO3-P output transistors 2SC3263/2SA1294, and the "Allegro-SANKENs" play "like a divine".
I am currently thinking about which INTERNET-interface to add to this amplifier to be able to listen to INTERNET-radio and which DAC and Multimedia-player-software to add to be able to listen to my 1TB of my ripped CDs.
Best regards - Rudi_Ratlos
Most of the parts that you can see on the attached pictures are "DIYed".
The case has been built by my carpenter-friend Gerhard.
The SYMASYM-integrated-amplifier consists of:
- two DUAL-Mono SYMASYM Black (Green!) - Beauty SYMASYM-PCBs
- Mains Schaffner-filter being followed by a mains-DC-filter and Soft-Power-On
- 4 x 25 VAC torroid transformer rated at 400VAC
- My VCPRe (doing the source selection, attenuation (via LDRs), .....)
- Every functionality can be controlled via a IRC - unit
This build is using the small SANKEN TO3-P output transistors 2SC3263/2SA1294, and the "Allegro-SANKENs" play "like a divine".
I am currently thinking about which INTERNET-interface to add to this amplifier to be able to listen to INTERNET-radio and which DAC and Multimedia-player-software to add to be able to listen to my 1TB of my ripped CDs.
Best regards - Rudi_Ratlos
