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Re: Solo Dallas - SVDS Replica

PostPosted: 19 Jan 2018, 23:43
by patricef
Did you make a prototype or just the drawing ?

Re: Solo Dallas - SVDS Replica

PostPosted: 20 Jan 2018, 06:15
by boby6kiler
just the drawning :D
j attends juste une réponse sur le mail que j e t ai envoyé sur slo mdr pour aller plus loin
ya quelque truc qui me chiffonne niveau alim merci

Re: Solo Dallas - SVDS Replica

PostPosted: 21 Jan 2018, 13:38
by GeoffroyLux
Nice Boby :thumbsup

Smells good I just received my NE570 and LM380 yesterday!
I will try it soon [smilie=rlp_smilie_242.gif]

Re: Solo Dallas - SVDS Replica

PostPosted: 21 Jan 2018, 17:43
by patricef
Some update: on my schematic, R14 should be removed. D3 value is 43A48A.
Voltage, 0V taken from input jack ring:
VCC: 12.09V
IC1 pins:
1: 5.81V
2: 5.82V
3: 5.73V
5: 3.64V
6: 0V
7: 3.64V
8: 11.58V

IC2 pins:
1: 0.95V
2.:1.79V
3: 1.79V
5: 1.80V
6: 1.79V
10: 7.24V
11: 7.24V
12: 1.80V
13: 11.58V
14: 1.80V
15: 1.79V
16: 0.78V

IC3 pins:
1,2,3: 0V
6: 5.06V
7: 11.73V
8: 11:87V

Re: Solo Dallas - SVDS Replica

PostPosted: 21 Jan 2018, 19:33
by EddieTavares
patricef great Job!!!

:applause: :applause: :applause:

Re: Solo Dallas - SVDS Replica

PostPosted: 21 Jan 2018, 20:27
by apollomusicservice
patricef wrote:Some update: on my schematic, R14 should be removed. D3 value is 43A48A.
Voltage, 0V taken from input jack ring:
VCC: 12.09V
IC1 pins:
1: 5.81V
2: 5.82V
3: 5.73V
5: 3.64V
6: 0V
7: 3.64V
8: 11.58V

Values at pin 6 and 7 on IC1 can't be different.

Re: Solo Dallas - SVDS Replica

PostPosted: 21 Jan 2018, 21:03
by patricef
apollomusicservice wrote:
patricef wrote:Some update: on my schematic, R14 should be removed. D3 value is 43A48A.
Voltage, 0V taken from input jack ring:
VCC: 12.09V
IC1 pins:
1: 5.81V
2: 5.82V
3: 5.73V
5: 3.64V
6: 3.64V
7: 3.64V
8: 11.58V

Values at pin 6 and 7 on IC1 can't be different.

My mistake, I rechecked again pin 6 and 7 are indeed at the same voltage.

Re: Solo Dallas - SVDS Replica

PostPosted: 27 Jan 2018, 22:49
by patricef
boby6kiler has been working hard on tracing and verifying the circuit. I'll post an updated version of the schematic soon, stay tuned !

Re: Solo Dallas - SVDS Replica

PostPosted: 28 Jan 2018, 05:54
by boby6kiler
:popcorn: :applause:
thanks patrice for this one

Re: Solo Dallas - SVDS Replica

PostPosted: 30 Jan 2018, 13:01
by patricef
Attached the latest schematic. Enjoy !

Re: Solo Dallas - SVDS Replica

PostPosted: 30 Jan 2018, 13:15
by boby6kiler
nice schematic patrice :D

i don't find a good alternative to this :
Image

any idea ?

Re: Solo Dallas - SVDS Replica

PostPosted: 30 Jan 2018, 14:00
by EddieTavares
It looks like a diode, propably a 1n4148 smd version.

Re: Solo Dallas - SVDS Replica

PostPosted: 30 Jan 2018, 14:13
by boby6kiler
patricef mesure 0.246V with the multimeter in diode mode

Re: Solo Dallas - SVDS Replica

PostPosted: 30 Jan 2018, 14:29
by EddieTavares
This is the D5 in the patricief's schematic if I am correct. It looks like a reverse flow protection, I don't believe that it makes any tonal difference...

I believe that the sollo dalas guys tried to reproduce in the pedal every single component present in the original Shaeffer gadget, Why they implement R9, R15 and R17 all 8k2 resistors simply dropping a litle voltage?

Re: Solo Dallas - SVDS Replica

PostPosted: 01 Feb 2018, 11:03
by RiGLEY
boby6kiler wrote:nice schematic patrice :D

i don't find a good alternative to this :
[ Image ]

any idea ?


Yeah, it looks like a diode by Vishay. Can't find anything specific by searching 43A 48A.

Re: Solo Dallas - SVDS Replica

PostPosted: 01 Feb 2018, 16:09
by GeoffroyLux
1N4348 ? Smd SOD-123 size ?
But I didn't find anything

Re: Solo Dallas - SVDS Replica

PostPosted: 08 Feb 2018, 09:50
by lovetone
Hi, I drew this up a while ago and forgot all about it its very close to the schematic drawn by apollomusicservice with slight differences.

At the time I removed some of the surface mount capacitors to check the values so some on this drawing are low values but thats what I measured at the time.

This may help with some of the missing values.

Sorry for the drawing but I don't have a drawing programme.

Re: Solo Dallas - SVDS Replica

PostPosted: 08 Feb 2018, 18:23
by boby6kiler
-the 10nf in ic1 pin 2/1 verified with multimeter removed from the board?
-the 1nf in the area of 8,2k/2,2k verified with multimeter removed from the board?
-the 16pf in ic3 pin 3/6 verified with multimeter removed from the board?
thanks

Re: Solo Dallas - SVDS Replica

PostPosted: 09 Feb 2018, 09:01
by lovetone
boby6kiler wrote:-the 10nf in ic1 pin 2/1 verified with multimeter removed from the board?
-the 1nf in the area of 8,2k/2,2k verified with multimeter removed from the board?
-the 16pf in ic3 pin 3/6 verified with multimeter removed from the board?
thanks


Yes as far as I can remember if I could not measure the capacitor in the board then I removed it.

Re: Solo Dallas - SVDS Replica

PostPosted: 09 Feb 2018, 09:35
by boby6kiler
thanks i will try this values