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σ26 negative output PSU announcement

sigma25, sigma26, sigma24

σ26 negative output PSU announcement

Postby amb » July 9th, 2016, 4:30 am

I am happy to announce the σ26, a negative version of the σ25 PSU board. The σ26 has the same size and very similar layout as the σ25, and supports the optional σ24 EI-30 transformer board. The supported voltage regulator is the 79xx, LM320, LM2990, or the σ79. Most polarized parts on the σ26 are to be mounted in reversed orientation compared to the σ25 (the bridge rectifier, electrolytic capacitors, diode and LED).

Since σ26 is essentially the same as the σ25 (except to accommodate the negative voltage regulator's different pin-out, and reversed voltage polarities), there is no development forum thread for it.

σ26 boards are now being manufactured. The release date is in approximately 3 weeks from now, around the same time σ78 and σ79 voltage regulators should also become available.

The official σ26 website is now up. Have a look.

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Re: σ26 negative output PSU announcement

Postby poseidonsvoice » July 22nd, 2016, 1:06 am

Thank you sir for the development time, efforts, and above all, your generosity in providing these kits to the DIY community. I greatly look forward to ordering the sigma 24, 25, 26, 78 and 79 boards hopefully by the end of July.

You have our gratitude for providing some of the finest kits both in design and particularly in documentation in the audiophile industry! I can clearly see that you take great pride in your efforts! Other kit designers should look at AMB as a beacon! You have set the golden standard for years to come! Kudos.

Best,
Anand.

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Re: σ26 negative output PSU announcement

Postby amb » July 22nd, 2016, 2:10 am

Thanks for the compliments! I try my best.
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σ26 PCBs arrived and now available!

Postby amb » July 27th, 2016, 12:20 pm

Hi folks, today is a busy day at AMB. The σ26 PCBs are now here, I have verified them and they are now available at AMB audio shop!
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