Fool tone fool drive two schematic

[Russ]

That's kind of strange, my newer version factory (3-way switch) FD-2 uses a 510K biasing resistor on the second transistor instead of the 150K shown on the Fooltone schematic.

Does Radio Shack even still sell the epoxy diodes?

Russ

[mojotron]

That's kind of strange, my newer version factory (3-way switch) FD-2 uses a 510K biasing resistor on the second transistor instead of the 150K shown on the Fooltone schematic.

Does Radio Shack even still sell the epoxy diodes?

Russ

I'm going by the measured value - but mine is 150k. But, I used 1M in mine and it sounds a lot better then the one I bought.

RS sells the epoxy diodes - it's their standard stock - you'll find it in their rectifier selection.. The ones I used were about a thick as a pencil/pen and had leads to big I have to use a 1/32nd bit for the hole.

[Ghandi]

Is the 47k/.01uF combiation in the comp-cut mode connected to pin 7?
Thanks!

[mojotron]

Is the 47k/.01uF combiation in the comp-cut mode connected to pin 7?
Thanks!

I don't think so, because I made my own schematic a while ago and built mine. That section is where I made a mistake in my schematic so when I use the comp-cut on the level is much lower - and that would indicate that I was feeding more of the signal than unity... I'll pop mine open this weekend and make this change and let you know..

[bobbletrox]

RS sells the epoxy diodes - it's their standard stock - you'll find it in their rectifier selection.. The ones I used were about a thick as a pencil/pen and had leads to big I have to use a 1/32nd bit for the hole.

I thought the diodes were just regular silicons that had been concealed in epoxy goop.

[mojotron]

RS sells the epoxy diodes - it's their standard stock - you'll find it in their rectifier selection.. The ones I used were about a thick as a pencil/pen and had leads to big I have to use a 1/32nd bit for the hole.

I thought the diodes were just regular silicons that had been concealed in epoxy goop.

This has been verified by several sources. The sound is dead on, the rectifier did the trick.

[waldo041]

RS sells the epoxy diodes - it's their standard stock - you'll find it in their rectifier selection.. The ones I used were about a thick as a pencil/pen and had leads to big I have to use a 1/32nd bit for the hole.

I thought the diodes were just regular silicons that had been concealed in epoxy goop.

This has been verified by several sources. The sound is dead on, the rectifier did the trick.

great info. can anybody tell me the stock number for the radio shack  epoxy diodes part? thanks in advance. peace, waldo

[mojotron]

RS sells the epoxy diodes - it's their standard stock - you'll find it in their rectifier selection.. The ones I used were about a thick as a pencil/pen and had leads to big I have to use a 1/32nd bit for the hole.

I thought the diodes were just regular silicons that had been concealed in epoxy goop.

This has been verified by several sources. The sound is dead on, the rectifier did the trick.

great info. can anybody tell me the stock number for the radio shack  epoxy diodes part? thanks in advance. peace, waldo

It looks like they are Catalog #: 276-1661 - Next time I run over there I can give you an exact answer

[stm]

I'm a bit confused about these rectifier diodes.

I understand there are only TWO thick rectifier diodes (no assymmetry).  Am I right?

RAT Shack has the 1N5408, which is a 3 Ampere rectifier diode that fits in the "thick as a pencil with fat leads" description.

[RDV]

Rat Shack Diode Page

RDV

[waldo041]

Thank You RDV! i just finished drawing out a board for press and peel and once i can measure these rectifiers for my board and ensure they fit i will hope to be even more grateful.thanks again. peace, waldo

[waldo041]

I'm a bit confused about these rectifier diodes.

I understand there are only TWO thick rectifier diodes (no assymmetry).  Am I right?

RAT Shack has the 1N5408, which is a 3 Ampere rectifier diode that fits in the "thick as a pencil with fat leads" description.

Yes you are right, there are 2 diodes. the assymmetry part comes i believe from mismatching the forward voltage of the 2 diodes. aron's simplemods/tips covers asymmetrical distortion with diodes.
hope this helps. peace, waldo

http://www.diystompboxes.com/cnews/mods.html

[mojotron]

I'm a bit confused about these rectifier diodes.

I understand there are only TWO thick rectifier diodes (no assymmetry).  Am I right?

RAT Shack has the 1N5408, which is a 3 Ampere rectifier diode that fits in the "thick as a pencil with fat leads" description.

Actually, you use one 1n914 and one rectifier diode - so it's not a symmetric circuit.

Also, if you do a direct A/B you'll find that there might be some pot taper differences - but the sound is the same if you set the pots by measured value.

[stm]

Interesting, so it is one 1N914 (or 1N4148) and one large rectifier diode.

Curiously I have another Fooltone 2 schematic that I got from the web drawn by J.E. Greene on 12/22/97 that indicates 1N4148 in one direction, and 1N4007+1N34A in the other.  Still assymmetric but different.  This schem also points out the feedback cap is 51pF.  This is the fooltone 2 without the 3 position switch.  I wonder if the change of the diodes is really sooo important.

[mojotron]

Interesting, so it is one 1N914 (or 1N4148) and one large rectifier diode.

Curiously I have another Fooltone 2 schematic that I got from the web drawn by J.E. Greene on 12/22/97 that indicates 1N4148 in one direction, and 1N4007+1N34A in the other.  Still assymmetric but different.  This schem also points out the feedback cap is 51pF.  This is the fooltone 2 without the 3 position switch.  I wonder if the change of the diodes is really sooo important.

I actually layed out my circuit so that I could have several combinations of diodes.. Can you email me your other schematic - I would like to check some stuff out?

mojotronics@hotmail.com

[stm]

Going on with the free web idea, here is the circuit for everybody to see:

http://tinypic.com/1eayx2

[Dirk_Hendrik]

Thanks for sharing the schematic. From the DMM reading list provided in combination with the colour band I'd like to make some comments:

- R3 is an 18K resistor. The first band is Brown. Not purple
- R7 is a 220 ohms resistor. The 3rd band is Brown. Not purple
- R11 and R21 are 4k7. This means that the first band is yellow and probably about the same colour as the resistor.
- If R13 and R18 are really 1 Meg the 3rd band should be green. Otherwise these resistors are 10 Meg.
- R22 suggests 150k as discussed in this thread. I don't know what to make of the colours read.

[O]

Sorry to dig this up from the 5th page, but this is going to be my weekend build. Does anyone have any pointers, advice, etc to give?