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Topics - Blisterfingers

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1
Build Reports / 2-in-1 Ge Fuzz Face and Rangemaster build
« on: December 26, 2019, 05:14:15 PM »
Hi all,
Just completed this build using a Black Horse Effects 1968 Fuzz PCB (thanks to electricb for the board).
Fuzz Face side uses two Mullard OC77s and the Rangemaster uses a Mullard CV7005.







Graphics are a nod to analogman's SunLion and came from a one-month trial subscription to Adobe Stock.
This is my first pedal build in a few years and the first time using filmless decal paper (from sunnyscopa.com).
The knob labels are a little off centre - I must have nudged them in Illustrator without realising, but not going back for a re-do.

Very happy with the result - the Rangemaster masters range and the fuzz fuzzes as expected.
Next, a couple of 1590A builds in progress - a hipster and a rabbit hole. I may be developing a fuzz addiction!



2
How Do I? Beginner's Paradise. / Ge Fuzz Face biasing question
« on: December 13, 2019, 01:25:43 PM »
I've just about completed a 2-in-1 Ge Fuzz Face and Rangemaster build. Everything works first time (yay) but I can't quite get the bias point on the FF side within spec.

It's built using Black Horse Effects 1968 Fuzz PCB and the FF side uses an internal 10K bias trimmer plus an external 5KC bias pot (Sundial, as per the analogman Sunface)



With the Sundial centred the Q2 collector voltage ranges from 8.7VDC - 5.5VDC when adjusted using the internal trimmer.

If I have the Sundial all the way to the left (max resistance) I can get to the recommended 4.5V on the Q2 collector (and it sounds freaking awesome!), but it doesn't leave me with any other adjustment. So I think I need to increase the value of one or more of the resistors or the trimmer. Looking for confirmation that it's as simple as that and that I'm not missing anything else.

Transistors are Mullard OC77 that came from Smallbear:
  • Q1 hFE 113, leakage 159 uA
  • Q2 hFE 126, leakage 149 uA

Here are the voltage measurements (Sundial centred)
TransistorQ1Q2
Collector0.4765.5
Base0.1120.476
Emitter0.1120.356

Any suggestions welcomed

Thanks,
Dougal

3
How Do I? Beginner's Paradise. / Noob startup component stock
« on: December 20, 2018, 04:01:49 AM »
Hi all,
First post here after my introduction.
I'm looking to build up some component stock and have been doing lots of reading and searching.
I tried to analyse the Bills of Material for a bunch of different commercially available PCBs, starting with madbean, and have managed to incorporate lists for 23 circuits into an Excel sheet (happy to share if anyone wants a copy).

After a bit of data cleansing, the table below lists the values of most components and I've highlighted some of the most common ones.

madbean BOM analysis

ComponentType/RatingValues
CapacitorCeramic/MLCC4.7pF, 10pF, 15pF, 22pF, 27pF, 33pF, 47pF, 68pF, 100pF, 120pF, 150pF, 180pF, 220pF, 270pF, 330pF, 390pF, 470pF, 560pF, 820pF
CapacitorFilm1nF, 2.2nF, 3.3nF, 4.7nF, 6.8nF, 10nF, 15nF, 22nF, 39nF, 47nF, 100nF, 220nF, 1uF
CapacitorElectrolytic1uF, 2.2uF, 4.7uF, 10uF, 22uF, 47uF, 100uF
ResistorCarbon/Metal Film 1/4W, 1/8W22, 47, 100, 220, 330, 470, 560, 1k, 1.5k, 1.8k, 2k, 2.4k, 2.7k, 3.3k, 3.9k, 4.7k, 5.6k, 6.8k, 7.5k, 10k, 12k, 15k, 18k, 20k, 22k, 27k, 33k, 39k, 47k, 56k, 68k, 82k, 100k, 120k, 150k, 220k, 390k, 470k, 1M, 2.2M, 3.9M, 4.7M, 10M
DiodeVarious1n34a, 1N4001, 1N5817, 1n914, BAT46, 1n270, 1N4002
PotsVarious 10kA, 100kA, 250kA, 500kA, 1kB, 10kB, 25kB, 50kB, 100kB, 500kB, 100kB-Dual, 1kC, 5kC, 100kC, 500kC, 1MA, 1MC
TrimpotBourns 3362P1k, 5k, 10k, 20k, 25k, 50k, 100k, 250k, 500k
ICVarious4558, BTDR-3, LM1458, LM308, LM386, LT1054, PT2399, TC1044SCPA, TL062, TL072, TL074

So, here’s my stock acquisition plan to set me up with the basics but without spending too much up front.

Resistors:
Capacitors (10 of each value):
  • Ceramics - MLCC only. TDK or Murata CG0 – 4.7-820pF.
  • Film – EPCOS or WIMA box caps, 5mm lead spacing. 1nF-1uF.
  • Electros – Panasonic, Nichicon or Lelon. 1uF-100uF. 5mm height where possible. Min 25V, 1,000 hour rated,1.5-2.5mm lead spacing.
Others:
  • Diodes & LEDs – assorted pack from Smallbear or Tayda.
  • ICs – DIP8 sockets. Will buy ICs per-project to start with.
  • Pots & trimmers – Per-project to start with.
  • Audio Jacks – per project to start with but buy a few extras each time to build up stock.
  • Enclosures & knobs – Per-project to start with.
  • Power – Battery snaps and power jacks.
  • Transistors – As needed. Ge from known good sources like Smallbear.

I’m familiar with most of the common suppliers and have bought stuff from Digi-Key and Mouser in the past.

Is this a good starting point or have I over-analysed things!
Very happy to hear feedback and suggestions on values, brands, missing items etc.



4
Introductions / Greetings from Auckland New Zealand
« on: December 16, 2018, 10:18:35 PM »
Hi everyone,
Thought I'd better check in after lurking for a little while and then buying some boards from MBP.
I'm an Aussie living in beautiful New Zealand, getting back into amp and pedal building after an absence of a few years.
I build my first pedal in 2012 from a BYOC kit and it worked first time. The idea was that the pedal build would be "training wheels" for building an amp.

In hindsight I didn't quite appreciate the gap between the skills needed to put together a BYOC Triboost and the skills needed to knock out a working Blackface Vibrolux Reverb . . . but after much swearing and patient assistance from a few kind souls, it all came together.

I hadn't scratched the pedal itch though so I'm looking to get back into it by building one of every significant Fuzz Pedal known to man, starting with a Ge FuzzFace.

It's also a chance to collaborate with my wife who is a very talented artist. She'll be in charge of the artwork and we're looking forward to trying out a few different techniques.

Here's a shot of the BYOC TriBoost:






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