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There are several ways to make your own Muffsy Phono Preamp, but the power supply has been missing. Until now. Below are both gerbers and PDFs that allows you to order or etch your own power supply boards.

The signal to noise ratio (SNR) compares the level of the audio signal to the background noise. An SNR of at least 65 dB is what's needed to have a completely silent phono stage. The Muffsy Phono Preamp's SNR, with OPA2134, comes in at 79.46 dB as shown below.

The measurement of signal to noise ratio...

NOTE:

This modification is only intended for the Muffsy Phono Preamp together with the Muffsy Power Supply and Back Panel in the recommended B0905 enclosure. Before you try this, have a look at the other ways of eliminating hum.

Arno just completed building the Muffsy Phono Preamp, and was haunted by...

We've seen how the RIAA filter behaves with low and very low capacitor values. (See all simulation articles here) Now let's have a look at what happens if the capacitor values are higher than the recommended ones.

This is the Muffsy Phono Preamp with capacitor values that are 2.5% higher than specifi...

Ryan has built the Muffsy Phono Preamp, and wrote about it on his blog. Thanks for the great review Ryan!

He offers up some beautiful pictures of his build, and writes about the whole building experience.

I wanted to know what happened to the Muffsy RIAA compliance if the capacitors were out of spec, and started with a plausible scenario where the capacitors were 3% below their stated values.

This time, lets see what happens if the capacitor values are extremely low. Let's say they're 10% below what ...

Hot on the heals of the official Muffsy PCB, here comes another option.

Over at theslowdiyer's blog, you can now find the project files for the Muffsy Clone.

We've seen some revisions of the Muffsy Phono Preamp, from green to red,  through blue and finally the black PP-3. Now get ready for a new one, only this time you can't buy it from here.

The question of a more generic circuit board that will accept other components than the ones included in the...

The RIAA equalization added to vinyl records can and do vary wildly, and you might rightfully say that a phono stage's RIAA compliance doesn't matter too much.

It's still a standard, and it should be one of the considerations when choosing a phono stage.

The Muffsy Phono Preamp uses Wima MKS2 capacito...

You now have a third choice of operational amplifiers for the Muffsy Phono Preamp, the NJM2068D from New Japan Radio (datasheet, pdf).

The NJM2068D is a great op amp that sits between the NE5532 and OPA2134 performance wise. It draws less current, so it will be the best choice for battery powered Muf...