[33] Leo’s Fuzz

Date: July 20th, 2007 | Comments : [4] | Categories: pedals.


Anthony Leo Fuzz

Leo’s Fuzz from Pop Electronics

The February 1968 issue of Popular Electronics featured an article by Anthony Leo for a fuzz tone pedal for guitar use.

It was known at this time that back-to-back diodes could achieve a clipping effect on the signal but Leo was trying to achieve a different type of fuzz sound.

The design has more than a passing resemblance to the Fuzzface but with some important differences. There is feedback at the emitters and the output section has bit of an odd twist to it.

The 2N3565 transistors are silicon NPN devices with an hfe of about 300. If you decide to build one and cannot find that part, the common 2N2484 will be a good substitute or even a 2N5088.

My Dad was a subscriber to the magazine and this issue is one that I inherited from him. Popular Electronics is now defunct so there are no back issues available for sale, and I feel okay about publishing the scan of this 40-year-old article (okay, 39 years). Download the pdf file here:


A capacitor was left out and a correction was published in a subsequent issue: http://www.muzique.com/news/images/Leo.gif


4 Responses to “Leo’s Fuzz”

[43] john Says: 12:51 am, July 21st, 2007

wow, nice. i love reading these old ‘articles’. Keep up the great blog.

[44] Ben Niderberg Says: 4:15 pm, July 24th, 2007

Very neat. Nice to see something a little different. Some points of intrest (for me, anyway): That fuzztone was already de rigeur in 1968, even to PE editors; that the design was taken from our old friend EA; and that pople actually put clipping diodes across their OT or speaker terminals–yikes!!


[45] Manny Says: 1:56 am, July 28th, 2007

Just want to say thank you for all the info you are sharring on this website.
I am new to this FX thing but Love it and have been a DIYer for ever.

[547039] Demina Says: 1:38 pm, January 27th, 2015

Wow! I think I actually built this back then but it never worked!


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