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Old 11th November 2017, 12:12 AM   #9991
trebolo is offline trebolo  United States
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Hi I want to make some of apex's amps for myself. Can I buy pcb's somewhere. Or can I get pdf's of the copper so I can etch myself? I have read through most of thread and may have misssed it. I like the fx8 and a few other small ones especially
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Old 11th November 2017, 03:32 AM   #9992
xrk971 is offline xrk971  United States
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There are several Gerber files posted for FX8 (as well as many other amps). Send those Gerber files to one of the Chinese board houses and you can buy 10 for $2 plus $20 shipping via DHL to US. It may cost less to other countries. India is $8 for example. There is a thread called Index of Apex amps. The directory in that thread will give you links to locations of Gerbers. Many amps also have pdfs of copper traces and you can do your own etching at home.
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Old 11th November 2017, 09:35 AM   #9993
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Default 1000 pages!

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Old 11th November 2017, 09:49 AM   #9994
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Old 11th November 2017, 12:39 PM   #9995
prasi is online now prasi  India
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Quote:
Originally Posted by trebolo View Post
Hi I want to make some of apex's amps for myself. Can I buy pcb's somewhere. Or can I get pdf's of the copper so I can etch myself? I have read through most of thread and may have misssed it. I like the fx8 and a few other small ones especially
Build the APEX FX-8 Bimo mod as reported by xrk and others.

Its already posted in thread , both gerbers, and diya pdf files. here
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you can send the gerber zip file to any of the chinese board houses wihout facing any issues.

Schema here
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bias procedure

Procedure for bias.

1. you will need 2 nos. of 10ohm 1W/2W resistors.
1a. turn the trim pot so that resistance between first and third leg of trimmer is approx 250 ohm.
2. Connect one lead these 10ohm resistors in series with your + and - rail wires of psu.
3. connect the other lead of resistors to amplifier +/- supply connector on amp pcb.
4. switch on supply and measure the voltage drop across these rail resistors.
4a. measure the voltage between spk out and ground. this is offset. it should be less than +/-30mV. Good matching of Hfe of i/p transistor pair (Q1/Q3) will ensure that offset is close to zero.
5. total quiescient current is given by I= V/10ohm
6. set the pot so that voltage drop across 10 ohm rail resistors is about 1V to 1.1 V.

7. Let the amp warm up for 1/2 an hour recheck the bias
8. Adjust pot if required to have voltage drop of 1 to 1.1 V.
9. This will ensure that you get a bias through o/p stage of approx. 100mA.


let me know, if you need anything else.
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Old 11th November 2017, 12:43 PM   #9996
prasi is online now prasi  India
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Quote:
Originally Posted by smartx21 View Post

wonder who will be posting the 10,000th post, lucky him!

long live "100W Ultimate Fidelity Amplifier"
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Old 11th November 2017, 12:57 PM   #9997
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by trebolo View Post
Hi I want to make some of apex's amps for myself. Can I buy pcb's somewhere. Or can I get pdf's of the copper so I can etch myself? I have read through most of thread and may have misssed it. I like the fx8 and a few other small ones especially
For the adventurous, the FX8 Bimo runs superbly at 1.2amp bias current and 24v rails for pure Class A up to 16wrms. That's what I am running now and it's great sounding. Winter is here and I don't mind having some extra heat in the lab to keep things comfy

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Last edited by xrk971; 11th November 2017 at 12:59 PM.
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Old 11th November 2017, 01:01 PM   #9998
Ultima Thule is offline Ultima Thule  Europe
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When this thread passes 10,000th post it's time for the next level... "10,000W Ultimate Fidelity Amplifier"

Have a good weekend everyone around the globe!
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Old 11th November 2017, 05:40 PM   #9999
trebolo is offline trebolo  United States
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Thanks for the reply, I am making a couple FH9 this morning since I found the PDF's from Sonal Kunal. Thank you Sonal for the hard work. And the rest of the group. This truly is a unique post. I am surprised its not in a separate forum. I will be sending off some gerbers soon. I am just making sure I send the correct ones. The directory of Apex is great! I will be posting my Apex amplifiers as soon as I get something interesting going here! One more makes 10,000!!!
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Old 11th November 2017, 05:49 PM   #10000
44250 is offline 44250  Serbia
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10000 all the best to all that contributed to this thread specialy to Mile Slavković: thank you for all that you have given to support DIY community all around the world!
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Last edited by 44250; 11th November 2017 at 05:52 PM.
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