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Old 30th January 2012, 07:50 PM   #1
PKI is offline PKI  United States
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Default Yet another Aleph 5.

Greetings!
I am starting my Aleph 5 project, I've read many topics on the forum about it, however, I have some questions and really appreciate if you help me with them.
I attached the diagram of the amp. Ti will be in mono-block form factor.
1) Transformer: Are avel 625VA 25V good choice for the amp?
Avel Y236850 625VA 25V+25V Toroidal Transformer 122-675
or it is better to go with 30V and have a bit bigger rails?
2) PS caps: Is there any difference in how many caps to use?
I mean have two 60k uf caps or four 40k uf caps? Assuming that parameters of each capacitor are equal(not capacitance of cause). So only total capacitance or how you construct it?
3) Outputs: I am going to use pcb from kk-pcb.com, however, they are for a stereo amp, so can I put my output transistors on heatsinks(see pic) and use wires to connect them to pcb?
Thanks!
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Old 30th January 2012, 08:42 PM   #2
6L6 is offline 6L6  United States
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Yes, you can attach Fets to heat sink and wire them to pcb. I am going to have to in my build as well. There are many examples of aleph on the web where you can see it done that way.

Capacitor-- how many can you fit in your chassis? That is how many you want. More capaance is better.
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Old 30th January 2012, 08:52 PM   #3
PKI is offline PKI  United States
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Thanks!
But let say I can spend up to $150. So I can buy 4x47kuf now and thats it, or I can now buy 2x60k uf now and some day upgrade for another two of them.
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Old 2nd February 2012, 07:20 PM   #4
PKI is offline PKI  United States
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Guys, do I need inductors if I'm only using four 60k uf capacitors?
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Old 2nd February 2012, 07:32 PM   #5
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Its perfectly OK to mount the MOS-FETs to the heatsinks with remote wires.

My Aleph 4 started with CRC but ended up with CLC.
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Old 2nd February 2012, 07:46 PM   #6
PKI is offline PKI  United States
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But you have a bigger capacitance of you psu? I am not strong in inductors, what should I look at? AC/MC, current, voltage? Thanks.
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Old 3rd February 2012, 10:48 AM   #7
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Originally Posted by PKI View Post
But you have a bigger capacitance of you psu? I am not strong in inductors, what should I look at? AC/MC, current, voltage? Thanks.
you don't need inductors. use 0.5ohm 25W power resistor insted.
a minimum of 4 caps is a must.
if you mount the fets with wires, make sure to move the gate stoppers over to the fets to(221ohm).
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Old 3rd February 2012, 05:00 PM   #8
PKI is offline PKI  United States
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Originally Posted by AudioSan View Post
...gate stoppers over to the fets to(221ohm).
Do not get it, sorry :-(.
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Old 3rd February 2012, 07:26 PM   #9
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by KatieandDad View Post
Its perfectly OK to mount the MOS-FETs to the heatsinks with remote wires.

My Aleph 4 started with CRC but ended up with CLC.
Difference , improvements ....... ?
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Old 3rd February 2012, 07:36 PM   #10
Marra is online now Marra  United Kingdom
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Originally Posted by PKI View Post
Do not get it, sorry :-(.
Solder the gate stopper resistors to the mosfet not on the pcb.
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