huh
my brain on reserve
please , indulge me and point to exact schematic (you're using) ,and then I can reply something sensible
my brain on reserve
please , indulge me and point to exact schematic (you're using) ,and then I can reply something sensible
Hello Zen Mod. The schematic is below (from page 1 of this thread). I changed out the 10K resistors based on your post on page 3. But I wasn't paying attention to the value of Z1 and Z2.
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5V6 or 6V8 zeners will do the job
or put 2 series 1N4148 in series with existing zeners , cathodes opposite to zener cathodes
( so , pair of additional 1N4148 on each zener)
that will rise voltage on hand by some 1Vsomething
or put 2 series 1N4148 in series with existing zeners , cathodes opposite to zener cathodes
( so , pair of additional 1N4148 on each zener)
that will rise voltage on hand by some 1Vsomething
If you are planning to make the modification to Z1 and Z2, just remember to turn down
the pots before the initial powering up, to avoid the bias being too high.
the pots before the initial powering up, to avoid the bias being too high.
Did a bit of clean-up and added transformer housings. Because I am using the 4U chassis I had to remove the rectifier boards and replace them with rectifier bridges. I honestly can't hear the difference with the rectifier bridges versus the boards. However, even though the transformers are shielded the steel housings made an improvement. So I am pretty content/happy with the power supply at this point and don't plan on tweaking it anymore (famous last words). I made some F4 and M2 boards this week so I am looking forward to swapping the amp boards and comparing the sound of the 3 designs.
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Hello. What's the best / cheapest option for sourcing the F6 transformers in the UK? The diyaudio kit has been out of stock for ages...
Sorry for spamming this thread. Do people have any thoughts on using a 225VA transformer for 2x F6 channels into 4-8ohms? Too low? I listen at low levels generally.
I currently have 50 F6 Complete Kits (Including Transformers) ready for boxing up tonight.
I will stick them in the UPS tomorrow morning.
As 6L6 said, it will take a bit for them to actually reflect as In Stock in the store.
I also have 50 sets of just transformers that will be shipping in at some point soon.
I will stick them in the UPS tomorrow morning.
As 6L6 said, it will take a bit for them to actually reflect as In Stock in the store.
I also have 50 sets of just transformers that will be shipping in at some point soon.
chatziva - suggested transformer size is for bias requirements, not overall power. (I.E., use 300VA min)
Another first time F6
Hi Folks. I've been stopping by here occasionally for a decade, thinking, I ought to try building an amp sometime, finally gave it a go.
My case design is a little idiosyncratic - the back is blank, so it can go up against a wall, or on a shelf. The front will get a nice piece of wood, plain, and the top will be 3/8 glass, with ground edges, set up an 1/8" above the sides. The edges of the glass lighting up from the led's inside will serve as my power light.
I have a plan to add forced air if needed. I put the power inlet/switch up towards the front, to reach it easier, and the outputs on the back sides.
I used 6.9v zener (LM329)-3.3k R7,8; Jfets from punkydawgs, and VS-HFA25TB60-M3 Hexfred's for the rectifiers. Transformer is an Antek 3218 (300Va, dual 18v)
Please look the attached over and let me know if I have made any rookie mistakes, etc before I start it up. ( I built a bulb tester, and plan to unhook each amp side, test the psu, then one side at a time. I have the zeners turned down. The amp guides were great, but pics of the diyaudio psu rectifier boards wired up are a little shy (I found one) - so let me know if I have it right. Thank you to NP and all here.
Michael
Hi Folks. I've been stopping by here occasionally for a decade, thinking, I ought to try building an amp sometime, finally gave it a go.
My case design is a little idiosyncratic - the back is blank, so it can go up against a wall, or on a shelf. The front will get a nice piece of wood, plain, and the top will be 3/8 glass, with ground edges, set up an 1/8" above the sides. The edges of the glass lighting up from the led's inside will serve as my power light.
I have a plan to add forced air if needed. I put the power inlet/switch up towards the front, to reach it easier, and the outputs on the back sides.
I used 6.9v zener (LM329)-3.3k R7,8; Jfets from punkydawgs, and VS-HFA25TB60-M3 Hexfred's for the rectifiers. Transformer is an Antek 3218 (300Va, dual 18v)
Please look the attached over and let me know if I have made any rookie mistakes, etc before I start it up. ( I built a bulb tester, and plan to unhook each amp side, test the psu, then one side at a time. I have the zeners turned down. The amp guides were great, but pics of the diyaudio psu rectifier boards wired up are a little shy (I found one) - so let me know if I have it right. Thank you to NP and all here.
Michael
