Yes! Still4given (Terry) could take a new picture.
I'm trying to find also which post Apexaudio released the P30 preamp schematic (to go with the A33 amp...)
I'm trying to find also which post Apexaudio released the P30 preamp schematic (to go with the A33 amp...)
APEX index
I created this excel file with URLs to apex schematics here in forum, pcb, hints and others, up to date 68 schematics 😉
I dont copied whole posts into this excel file, only URL to post where is next info.
I created this excel file with URLs to apex schematics here in forum, pcb, hints and others, up to date 68 schematics 😉
I dont copied whole posts into this excel file, only URL to post where is next info.
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Thank you Miro! It will take me some time to extract this and link it. Maybe for now I will put a big link from post 1 to this file.
Ok. Last url in Schematic describtion or PCB means newest post with schematic or layout found to corresponding amp, and I left some old urls too (when somebody will check where is difference). Each amp have own sheet, sheets are sorted alphabetically.
Just updated to include A14 CFA amp as tested by Olafk. Nice amp.
Also added MM22 phono preamp.
Added P30 preamp
Added Simple Protect Circuit
That makes it 31 amps and 1 accessory circuit so far in this directory and still counting. Please keep them coming! 🙂
Also added MM22 phono preamp.
Added P30 preamp
Added Simple Protect Circuit
That makes it 31 amps and 1 accessory circuit so far in this directory and still counting. Please keep them coming! 🙂
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Just an update on the FX8 Bimo mod layout by Prasi. I finished the second board and now listening in stereo. Sounds great with a transient perfect FAST speaker. Very low distortion and snappy right sound.
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-775.html#post4755887
First sound test - fired right up without a hitch. The default pot setting gave a 1.75amp quiescent current (talk about class A 🙂) and I quickly adjusted down to 175mA. Sounds great and this layout is a pleasure to build. You do need some non E6 values of resistors though: 820R and 33R had to be specially ordered for this project.
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-775.html#post4755887
First sound test - fired right up without a hitch. The default pot setting gave a 1.75amp quiescent current (talk about class A 🙂) and I quickly adjusted down to 175mA. Sounds great and this layout is a pleasure to build. You do need some non E6 values of resistors though: 820R and 33R had to be specially ordered for this project.
Attachments
hi,
does any one have gerbers for apex ne555 speaker protect,its for diy useonly, can PM if you dont want post online
does any one have gerbers for apex ne555 speaker protect,its for diy useonly, can PM if you dont want post online
FH9 PCB by Sonal Kunal verified to work
The FH9 has been verified to work with Sonal Kunal's excellent PCB files (Gerber). This amp sounds fantastic - highly recommended.
http://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-784.html
I will start things off with the FH9 - Xrk Mod, a 50w vertical MOSFET variant of the FX8 with a Vbe multiplier for thermal control. The circuit was something I modified in an effort to get away from the more expensive and harder to find Renesas lateral MOSFET used by the FX8. I simulated it on Tina and all looked good so I modified my existing FX8 and it worked well. It has since been built by another member.
Apex Audio named it FH9:
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-733.html#post4702198
Schematic (note that Vbe multiplier was originally MPSA42 but that was changed to BD139 for convenient mounting hole):
PCB layout:
PCB pdf's:
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-746.html#post4718306
PCB Gerbers:
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-746.html#post4718422
Build photos:
Prototype mod from FX8 with Vbe multiplier on daughter board:
Real PCB build by Zoky2:
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-744.html#post4717829
This amp PCB has been confirmed to work as shown by Zoky2.
The FH9 has been verified to work with Sonal Kunal's excellent PCB files (Gerber). This amp sounds fantastic - highly recommended.
http://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-784.html
Very nice thread this XRK, thanks for making it. Just saw it today and everything in one place 🙂
You're welcome Prasi. If you want me to link anything to post 1 - just add a post here with hyperlinks and I will update post 1 index when I get a chance. This thread came out of a necessity for me as I kept finding myself looking back through the juggernaut of a thread by Apex to find one his earlier designs.
Glad folks are finding it useful.
Glad folks are finding it useful.
From the Studio Reference series
A few other links:
http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-33.html#post2596440 - all-FET SF-1 preamp buffer
http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-178.html#post4180772 - PP8 SR preamp
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There is also a Studio Reference amp (SR100, SR150 or SR200?) with jFET input. Those who have built it could link it here...
A few other links:
http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-33.html#post2596440 - all-FET SF-1 preamp buffer
http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-178.html#post4180772 - PP8 SR preamp
------------------------------------------------------------
There is also a Studio Reference amp (SR100, SR150 or SR200?) with jFET input. Those who have built it could link it here...
Update to include FH9 HV: FH9 modified with KSC3503/KSA1381 vs BD139/140's. This change and 52v rails makes the amp a 120w class amp. Tested and sounds great.
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-790.html#post4768191
Highly recommended build: great sounding, super simple, inexpensive, compact 120w class amp.
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-790.html#post4768191
Highly recommended build: great sounding, super simple, inexpensive, compact 120w class amp.
Just added Class A preamp power supply.
http://www.diyaudio.com/forums/power-supplies/164365-class-preamp-psu.html#post2140391
http://www.diyaudio.com/forums/power-supplies/164365-class-preamp-psu.html#post2140391
I am not familiar with SR. Just point to links here and I will add to post 1 index.
SR thread starts here:
http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier.html
Some of them have been listed some posts above, as marked in the attached picture.
You may also see:
[es] - Galerija: Mile Slavkovi?, APEX-audio
My intention is to build SR250H, where "H" stands for "hybrid", with an IGBT-like output.
