Searching for a power supply design engineer

[Want to be]

Who is the top quality people that can design a Linear Regulated Power Supply?
Must be very low noise (uv to nv)
Ability to run 5A on the +-48vdc lines with minimal effect on the the other voltages
CT Transformer is 117vac input and multi-tap secondary
I need the PS outputs to be:
+-48vdc
+-12vdc
+-19vdc
+6.3vac

 

[6L6]

What is the application?

What are the current requirements per supply?

Is this to be made around an existing transformer(s)? What are the specs of the transformer(s)?

 

[Mark Johnson]

Do you want the Top Quality designer to pay you? How much do you want them to pay you?

Do you want to pay the Top Quality Designer? How much do you want to pay them? Hourly rate, fixed price, or other arrangement?

Take a few minutes to exercise some Salesmanship. Explain to a Top Quality designer exactly WHY they should put aside their other projects, and work on your project instead? What is the additional benefit to them? How does their life improve if/when they decide to work on your job instead of Harmon Kardon International's job?

Top Quality designers have the luxury to pick and choose. Sell them on picking you. Sell them on picking your job. Why is your job more appealing than every single one of the $200/hour jobs in their already overflowing input box?

 

[Want to be]

 

[6L6]

There is no need for the all voltages you mention in reference to this schematic…

Again, I ask, what is the application?

Please answer this question directly, with as much detail as you can describe.

 

[Want to be]

The schematic is sliced into 4 files: PCB 1 channel A, PCB 1 channel B, PCB 2 channel A, PCB 2 channel B. PCB 1 channel A & B is as one project file so that it can be ported as PCB 1 board design file. PCB 2 channel A & B is alsa compiled as one another project file so that it can be ported as PCB 2 board design file. This method applied to easy managing netlist and additional connection headers, also to prevent the DRC confusion if two board in a single board design file.

 

[6L6]

This is from some late-70s or early-80s mid-fi receiver or integrated amplifier?

Do you have the schematic of the original PSU? That would be an extremely helpful place to begin understanding the requirements.

 

[Want to be]

Do you want to pay the Top Quality Designer? How much do you want to pay them? Hourly rate, fixed price, or other arrangement?

Take a few minutes to exercise some Salesmanship. Explain to a Top Quality designer exactly WHY they should put aside their other projects, and work on your project instead? What is the additional benefit to them? How does their life improve if/when they decide to work on your job instead of Harmon Kardon International's job?

Top Quality designers have the luxury to pick and choose. Sell them on picking you. Sell them on picking your job. Why is your job more appealing than every single one of the $200/hour jobs in their already overflowing input box?

I wish to pay for the service on a fixed price.

I am unsure how to answer your next two questions. I am not a major international corporation and I am sure that I am not worthy of their time. Maybe I could use this verbiage from from a famous speech: "I have a dream". In 1974 Yamaha released to the market a flagship integrated amplifier and this became the foundation that propelled them for the next fifty years. My dream is to incorporate modern technology into this unit and reintroduce it to the international market.

 

[6L6]

This is not a DIY thread then.

Best of luck in your endeavors.

 

[Want to be]

Original Regulated Power Supply:

Original unregulated Power Supply:

 

[Want to be]

This is not a DIY thread then.

This is a complete redesign

This is the original schematic. As you can see the only items being reused is the case, face plate, knobs, chassis

 

[Want to be]

Th Tone, Filter, power amp, is what I sent what is missing is the power supply.

We have already developed a new rear interface function PCB and added a four speed fan control:

 

[Want to be]

Existing transformer FYI
I am not stuck on reusing

 

[454Casull]

You do not need, and certainly cannot afford, a power supply with only nV levels of noise. Unless you really have some weird requirements that you aren't telling us about, you're better off simply buying an off-the-shelf power supply (or slightly customized, anyway) and integrating that.

 

[Want to be]

These are the power supply output as needed:
+50V DC and -50V DC for main power amp VAs and input-stage/LTP,
+15V DC and -15VDC for pre-amp, 24V DC for pre-amp's relays,
+B and -B for output-stage of main power amp and some other output for protection circuit etc. Have to provide the power transformer to apply the AC source as follow:
33V AC with CT for class-B output stage operation (after passed through rectifier and filter capacitor bank, it would be about + and - 48V DC)
12V AC wifh CT for class-A operation (after passed through the rectifier and filter capacitor bank it would be about +18V DC).
42V AC for VAS and input-stage operation (after passed through rectifier, it would be about +60V DC / -50V DC and would be regulated into +50V DC / -50V DC).

Have to provide the transformer to compatible with the PSU design with those listed outputs.

15V DC + and - and power supply regulator for pre-amp and relays (24V DC) can have input from 50V DC + -

 

[Want to be]

you're better off simply buying an off-the-shelf power supply and integrating that.

Should you know of such a power supply that can provide all the needed voltages, I sure would like to know about it.

 

[Want to be]

Unless you really have some weird requirements that you aren't telling us about,

I believe I have provided all the schematic information. Maybe I have been reading into too many post talking about very low noise power supplies.

 

[Want to be]

 

[Want to be]

Power Amp

 

[Want to be]

You do not need, and certainly cannot afford

The amount of money already spent with design and fabrication has been very expensive.
Not counting the four Goldpoint stepped attenuators