Help Aleph 5 ???

[xenofex]

Hi everyone,

I am in the process of building Aleph5 and just finished wiring up the power supply with Toroidal Transformer 500VA 30-0-30V I bought from RS components for each channel. The only thing is when I measure the output I got actually 33Vac at the secondary and after rectified with x2 bridge rectifiers and 2x47000uf got exactly 44Vdc at both positive / negative channel.

I've couple of question to asked

1) Can I run an Aleph 5 with 44Vdc rails voltage?
2) What If continue to using the power supply ( 44Vdc ) do I need to make any
Changes( components) in the original circuit?


Thanks for any information and will be greatly appreciate for any response / suggestion

Best Regards
cb

[till]

rectified voltage is AC(30)*sqrt(2) =DC(ca 42)


ok, maybe you will look in aleph 2 schematic (a2srv0.pdf) there you have 2*45 VDC aleph. Any difference between 5 and 2 you should be able to see there.

Maybe your aleph will be a little more aleph2 than aleph5 ?

[Christer]

Originally posted by xenofex
Hi everyone,

I am in the process of building Aleph5 and just finished wiring up the power supply with Toroidal Transformer 500VA 30-0-30V I bought from RS components for each channel. The only thing is when I measure the output I got actually 33Vac at the secondary and after rectified with x2 bridge rectifiers and 2x47000uf got exactly 44Vdc at both positive / negative channel.

You will probably get a lower voltage as soon as hook up your
amplifier to the PSU. Toroidal transformers usually have their
voltage specified at max. load, so they will give a higher voltage
when you run them unloaded. How much the voltage will
decrease depends both on the transformer and how much
power you pull out from it.

If you still get a too high voltage at max load, then it may be
the case that your mains voltage is too high.

[kristijan-k]

Hello xenofex,

You can run the Aleph 5 with your power supply.
You will get little higher power output and heat dissipation.
The changes of the components are not neccesary, if you have heatsinks that can withstand the little aditional dissipation.

Also, you can install the inductors in the power supply.
You will get little lower output voltage and much more quiet power supply.


Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

[xenofex]

Thanks for the information guys,

I added a separate pair of inductor between the cap but not sure the value unfortunately rails voltage remain the same. Probably I'll kept this value since I only need to add more heat sink and also going to gain some higher power output. Thanks again