Group Buy: SSR03 Super Regulator Power Supply

[tassosk]

Both packages received. Thanks.

 

[jammer55]

Boards arrived. Thanks Peranders.

 

[TheShaman]

Got my boards; excellent quality as always. Thanks!

 

[Jaap]

Max outputvoltage 9,2V with 18V transformer ?

Is it normal that I lose about 11 volts in the pre-regulator ?
I have 23 volt unstabilized and 11,8 volt at the output of the LM317T pre-regulator. I measure 9,2 volt max at the output.

 

[Polcom]

The boards!

Received the boards, many thanks for a great job!

 

[peranders]

Thanks.

I have updated the BOM for more voltages. Notice that the schematics with the blue text "Variant name, [No variations]" means that it contains optional parts and you should not use for building. Use only the schematics and the BOM with a variant name.

 

[PKI]

Boards arrived and they are beautiful, thanks!

 

[peranders]

Is it normal that I lose about 11 volts in the pre-regulator ?
I have 23 volt unstabilized and 11,8 volt at the output of the LM317T pre-regulator. I measure 9,2 volt max at the output.

Any success in tuning the voltage?

 

[PKI]

Can you please point me on the configuration I need to get 24-28V(adjustable) PSU. Sorry, for that, I just newer had deal with Reg. PSU.

 

[peranders]

28 volts out needs a 30-33 VAC transformer. Curious, why the need for a variable voltage and so little?

 

[PKI]

I am making a psu for BA3 as a pre, which needs around 24V. In future I will maybe try it as a FE for F4, that I will around need 30V. Do you think I can make it with max 30-35V and adjust down to 24V?

 

[peranders]

Sure, this is possible but it depends of desired output current.

 

[PKI]

0.5 amp at most, I guess.

 

[peranders]

A couple of days are left until I close the order list.

 

[Jaap]

Any success in tuning the voltage?

Exchanging the resistors was of course a hell of a job but in the end it worked 12,03 and 12,3 Volt. I did not use 1% resistors but used what I had in the bin.

 

[peranders]

Today is the last day to sign up for regulator pcb's. Hurry up!

 

[peranders]

Pcb's are ordered.

 

[olev]

Thanks for the group guy!

Is it safe to replace AD825ARZ with OPA627AU (used them in an I/V stage in a DAC years ago, now just gathering dust)? I can't find the unity gain bandwidth but according to the datasheet it is unity gain stable. Or is it a bad replacement performance wise even though it is safe to replace?

 

[olev]

I can't find the unity gain bandwidth but according to the datasheet it is unity gain stable.

Well I missed it at the first look, but it's in the datasheet curves plot section. It's about 17-18MHz at 0dB gain. Is this too slow for optimal performance? In the description Per-Anders writes "The AD825 has the bandwidth of 34-37 MHz at unity gain", so OPA627 would be only half of that speed. Would it degrade the cirquit from extra-low to low noise?

 

[peranders]

It will probably work. The noise is better.