Magnavibe

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The official video, short but sweet, totally got me.
Layout by Sabrotone.
I made a little daughter board to have the led/ldr assembly by itself.
I tried many different combinations of led/ldr.

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In the end i picked an ultra bright blue led and a massive plastuc encapsulated ldr i put aside cos it was too big from my last univibe project!

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Remember the tip of the led has to be looking the ldr in the face. Heres how i made a little lightshield.. from a midi plug, chopped both sides. Inserted the led at the wider end, and mounted the led in its holder in reverse: granted stability.

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Works a charm.
Sounds of the work in progress:

LED shootout using the chosen LDR (very big one, see above):

LDR shootout using the chosen LED (ultrabright blue):

bea!
yours truly

Germanium Mosrite Fuzzrite

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Stock values.
Nos italian caps.
I tried a lot of different trannies combos..
Check the usual Soundcloud stream for the full audio repornage.
2n508 on q1, hfe 153
2n1307 on q2, hfe 83
Piercing!
And.. yesterday i listened for the first time to an Iron Butterfly record..

sonic evidence;

please if you feel inclined, and can stomach bad guitar playing, check out the trannies shootout at the same Soundcloud stream..

bea!
yours truly

P2P Mosrite Fuzzrite

Using 2n2222 transistors..
I must say this sounds great. Responds well to volume adjustments, cleans up to overdrive. Very usable.
If you turn down the fuzz it gets all maestro fz1 engulfed-like in a way..
Very vintage and garagey.

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Point to point using tagboardeffects’ layout.. with mid cut/mid boost switchie.

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And boxed (looks like the lad out of the Crazy World of Arthur Brown!)

bea!
yours truly

Two pedals for my bro

My brother took up playing electric guitar again. He asked me for some boxes..

2n1307 texas instruments fuzz face
Q1 hfe 200
Q2 hfe 198
(leakage, wartsnall measurements)

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This Fuzzface sounds GREAT. The best i built so far, possibly. Very subtleties responsive, can be hard, soft, gainy, bluesy. Amazing basses.

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The other box is a repeat percussion-using BC547 instead of mpsa18.. very quiet sounding, no ticking.
Very happy about these two.

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Golden: fuzzface; toy car green: repeat/percussion.

bea!
yours truly

Turning a jimmy dunplop High Gain pedal into a vintage specced wah wah

Oh well.. i got this volume pedal for cheap. I also rescued some BC173B and 4x early 70es italian inductors (red, white) from a Farfisa organ i recently dissected.
I bought a vox v847 pcb from a reputable greek seller on ebay.
After cross checking caps and resistors differences, i took the plunge to make a mccoy of sorts.

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The mccoy calls for a bipolarised 4uF cap. Somewhere i read the original also used a 3.9uF so a tropical fish of this value was chosen.
I also tried to change the resistance value of the pot from 250k down to 100k as called for by putting a 166 resistor between the lugs 1 and 3 of the stock hotpotz.
Transistors measured hfe: 395 and 320. I used the gainier one for q1.
Upon firing it, the wah was almost non existent.
Measuring the inductor, it appeared to be the same Henrys value as the black 80es inductor of my dunlop crybaby so possibly it’s not the inductor’s fault.
I changed the 3.9uF tropical fish for a 4.7uF blue polarised Philips.
Much better..
I also changed the pot’s range of sweep, using the “pinion mod”, adding more bass to the curve.

To be contd

bea!
yours truly

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