Aleph Jzm

[audiorado]

It cant be 😁😁😁😁
Yes I agree is verry symple and diy friendly project.But I must say for someone that not have hi-tech mesurments gear and knowledge this is a perfect start project in hifi world of A class amps and their sound signature😉

 

[Charly1613]

I have a Nelson Pass Amp CAmp (for a pair of tweeters Raal, very happy) and I pre order also for 1 Aleph Jzm for another project...could you tell me the differences of this 2 amps? power, sound,etc.
Sorry if this is not the correct forum asking this request.
best regards

 

[Zen Mod]

Aleph J is sort of Big ACA

just chill and enjoy in building

 

[vinay]

What is the most run of wire from the boards to the output mosfets if I cannot solder them to boards directly?

When I built the A75 I think i used like 6-8" with no problems.

 

[Jacruzer787]

Progress report!!!

 

[Toys4Boys]

So very close in sight! Tomorrow she should be singing!

 

[birdbox]

Progress report recieved.....

(GIF inspired by the 1995 hit movie, National Lampoons Senior Trip)

 

[Extreme_Boky]

That toroid transformer caddy (especially the rainbow-coloured one I saw earlier...), with the tiara on top, does look very sexy...

 

[Russellc]

Just got ship notice from Modushop, guess chassis has been shipped! (Special Pass DIY version).

 

[Jacruzer787]

That toroid transformer caddy (especially the rainbow-coloured one I saw earlier...), with the tiara on top, does look very sexy...

Yeah I tried attaching the tiara and it was not working with the rainbow one. Tried it with the white one and was able to get it to work, so left that one on instead.

 

[Jacruzer787]

In my experience, since it was brought up a while ago. The 4U chassis from modushop is excellent. I got the iron covers, cheapest version so around $260-270 shipped to US. The thing is built like a tank. Looks super nice and its excellent to work with, so if anyone is considering it, I highly recommended it. Of course the new limited edition PASS DIY is even nicer and roomier. Could you make it for less? Probably. Depends on what your time is worth, and if you have the tools needed to complete it. YMMV

 

[Alan D UK]

My kit is being shipped but have started building the PCB on the Thatcher board, Randy Thatcher said the 8 caps choice is down to how deep your wallet is, can anyone assist, have priced them on the BOM power supply range from 4.29 UK Pounds to £8.43 or have someone used alternative caps.
This will be my first mains powered AMP after building the ACA Mini.
Regards
Alan

 

[Dennis Hui]

BOM power supply range

Do you have a link to this BOM?

 

[Zen Mod]

literally any of these

with 18Vac Donut secondaries take 25Vdc caps

up from 18Vac secs, take 35Vdc caps

up to 35mm Dia

https://www.mouser.co.uk/c/passive-components/capacitors/aluminum-electrolytic-capacitors/aluminum-electrolytic-capacitors-snap-in/?capacitance=33000 uF&voltage rating dc=25 VDC~~35 VDC&instock=y&rp=passive-components/capacitors/aluminum-electrolytic-capacitors/aluminum-electrolytic-capacitors-snap-in|~Voltage Rating DC&sort=pricing

 

[ItsAllInMyHead]

Randy Thatcher said the 8 caps choice is down to how deep your wallet is, can anyone assist,

literally any of these

I'd narrow it to 10mm lead spacing and 2 pins to make your life easier with Randy's boards.

 

[Zen Mod]

tnx
I forgot lead spacing, so this link covering snap in, 10mm lead spacing only:

https://www.mouser.co.uk/c/passive-...rolytic-capacitors-snap-in|~Voltage Rating DC

 

[Zen Mod]

and this only to 35mm Dia

https://www.mouser.co.uk/c/passive-...pacitors-snap-in|~Voltage Rating DC|~Diameter

 

[rhthatcher]

Key criteria for sorting/selecting
10mm Lead Spacing
2 Pin. Most will be "snap in"
up to 35mm diameter (you'll likely see 30 and 35mm options. Avoid 40mm, for example)
25V for 18V secondaries
35V or >18V secondaries
Check the "In stock" box.

Now you're going to pick capacitance value based on how much you want to spend.

What is the 22,000uF option price x 8 caps?
27,000uF price x 8?
33,000uF price x 8?
47,000uF price x 8?

Here's a Digikey search to try. This is for 25V options 22kuF and up. You can switch to 35V if you need to.
https://www.digikey.com/en/products/filter/aluminum-electrolytic-capacitors/58?s=N4IgjCBcoKwAwA4qgMZQGYEMA2BnApgDQgD2UA2iAExgAsAzEgLrEAOALlCAMrsBOASwB2AcxABfYlTi0AnMhBpIWPEVIUQANgRxdAAgCtAMRBTp+46eoB2XXEMni9enYdX6s15eK1bFxyAwml4mLCAcXACqQgLsAPLoALL4mLgArnz4ElJw1vLQihg4BMRkkJRUMHoAaiBhEZAg0bEJyakZWZIgALT5qFD8aWpllBBMXd1UCkqDwxowdeJdmgoCACZc3WBwEGycjVbsAJ6sWY2paEtAA

 

[ItsAllInMyHead]

Sorry... on mobile... harder for me to post more thoroughly...

Also, Alan D - Consider if you will use the PSU for any other projects... or if your mains runs a touch higher than typical (mine does)... and if you sometimes test your PSU unloaded for longer periods of time... and if you like to just have a little extra "room" ...

It's a super versatile board, and I move it around projects a little bit... My use case may not be typical. Also, unloaded, my rails are typically ~27VDC... my mains runs a touch high, and I tend to use 400VA transformers rated at 115VAC and low"ish" drop rectifiers ... so...

That's a long way to say... I typically use 35V caps for PSUs like this, if only because it makes me feel better and it's not typically "that much more". YMMV

 

[Dennis Hui]

A few quick points in addition to what's been mentioned:

1) Sometimes 10 pieces is cheaper than 8 with quantity price breaks.
2) IIRC the original AJ had 8 x 15000uF while later J2 used 12 x 15000uF so the aforementioned configurations should all be adequate; you'll have to decide how much you want to spend to gild the lily.
3) Check both Digikey and Mouser for what's available and prices.