Skip to main content

A bit of Muff Fuzz

After the success of Pete's Bazz Fuss I figured it was my own turn. I've only ever used stripboard in the past, but wanted to have a go at building a circuit on perfboard instead, so wanted to choose something relatively simple for a first go. The circuit I chose was the EHX™Muff Fuzz™ which despite it's name os more of an overdrive than a fuzz type effect.

I drew up my own perfboard layout as below, taking care to make sure the components could be connected easily when soldering.


Soldering up was relatively painless, and I was quite please with the neatness. You can see from the pic below that it is a mirror image of the layout above.


I used 2N5088's for the transistors and 1N60P for the diodes. The picture below shows the component side of the board prior to shortening the transistor legs. 



It worked pretty much straight away to my relief, and sounded OK, so I boxed it up in a 1590A sized box (always a painful process) and here is the finished article. I just stuck some labels on for now so I wouldn't forget what was inside, but might (unlikely) paint the enclosure at some point.


I'm quite satisfied with the result. It's a decent sounding overdrive, however, it's only around unity gain with the volume maxed out. That being said, I tried it with a not-so-new 9V battery (plugged in externally just in case anyone is under the misconception that I squeezed a battery in there) which was only putting out about 7.8V, so it might sound better when I plug in a decent 9V supply. 

I'll try to add some sound clips later.






Comments

Popular posts from this blog

Vox Pathfinder 15 Tremolo Repair

Last year, I snapped up a Vox Pathfinder 15 (non-reverb) combo amplifier from ebay. The seller was a charity shop, and the amplifier was listed as "untested", so I was taking a bit of a gamble, but figured I'd have a good chance of being able to fix it it it wasn't working, and cosmetically, it looked almost mint. When it arrived, I plugged it in, and as you guessed, it was not working. Barely any sound, and what sound there was was horribly distorted. One thin I did notice was the the power on LED was not aligned correctly with the hole in the back panel, so I did quickly took it apart, and realigned the potentiometers and LED indicator, but didn't have a look in detail at the circuit. I put it back together, but the problem remained. My guess was that the problem was the famous "cambridgitis" (just google that term and you'll find all about it). Basically, a problem where the optocoupler that controls the tremolo circuit fails. A common failure

Vox Pathfinder 10 and Pathfinder 15 Simulation

I've got a Vox Pathfinder 10 amplifier that I bought a couple of years ago, and I love it. It's a great little amplifier, but I don't care for the distortion channel, it just sounds harsh to my ears. There are quite simple modifications that can be done to this amplifier to remove the clipping LED's and increase the boost of the clean channel (check out Ben Craven's mods  for details). I'd been considering doing some of these, but whilst researching the subject, I discovered that the currently out of production (as at Nov '18)  Pathfinder 15/15R generally receives a lot more love than the Pathfinder 10. I found schematics for both the PF15 and the PF15R online, and saw that there were a lot of similarities between the PF10 and the PF15, particularly the earlier non-reverb PF15. The PF15R (with reverb) is quite a bit different after the first two opamp stages. I thought I'd model both the PF10 and PF15 pre-amp stages in LTspice  to see how they compar

Pete's Bazz Fuss

It's been ages since I built an effects pedal, so to get my soldering chops back up to speed, I decided I'd build a simple fuzz pedal for my long-time friend Pete as a surprise present for his impending birthday. The circuit I chose was the Bazz Fuss (yes that's the correct name)  which you can read about here if you care to. I went for the basic v1.0 of the circuit and used a 2N3904 for the transistor, and boxed everything in a 1590A sized enclosure. Despite a number of stupid mistakes that I had to rectify, I got it all done and boxed within a day, complete with lo-fi graphics. Here's a gut-shot. gut-shot And here is the finished item. lo-fi graphic It sounded OK when I played it although it needed the volume knob maxxed out to get the best out of it. Maybe a higher gain transistor would have been better still. I'm pretty sure Pete will like it though.