Lehle - Sunday Driver  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
User avatar
kusi
Breadboard Brother
Information
Posts: 114
Joined: 15 Aug 2007, 20:45
Has thanked: 2 times
Been thanked: 53 times

Post by kusi »

hello my friends,

long time no see, i hope everyone is still alive and doing great? :D

i just spent some minutes tracing the lehle sunday driver, a great sounding buffer / booster which i use in the studio all the time to track guitar di's (instead of the interface/preamp hi-z in).
nothing too special. the power-supply is a bit strange, it's not the best idea to power a 9v linear regulator with 7,5V imho. also the bias-offset of 0,125V, not sure if it's really worth the effort.

let me know what you think!

cheers,
kusi
Attachments
20170321_071423.jpg
20170321_071412.jpg
sd driver.pdf
(34.02 KiB) Downloaded 731 times

User avatar
zoetrop
Information
Posts: 8
Joined: 19 Apr 2014, 08:24
Has thanked: 4 times
Been thanked: 26 times

Post by zoetrop »

Thanks, I really like your schematic and thanks for your effort! could you please double-check R4, in the photo it looks like 4k7 instead of 47k (which would lead to a ~ 1.58 V bias)?

User avatar
kusi
Breadboard Brother
Information
Posts: 114
Joined: 15 Aug 2007, 20:45
Has thanked: 2 times
Been thanked: 53 times

Post by kusi »

thanks! r4 is 47k, voltage of 0,125V is measured. someone posted the schematic of Lehles paralell pedal here, the small bias-offset is similar.
viewtopic.php?f=1&t=27364&hilit=lehle

User avatar
apollomusicservice
Resistor Ronker
Information
Posts: 338
Joined: 04 Jun 2012, 11:54
Has thanked: 65 times
Been thanked: 828 times
Contact:

Post by apollomusicservice »

C2=100n
C6=10u
C12=1n
C13=120p
C14=330p
C15=15p
30-50mA current consumption

User avatar
x-tn
Breadboard Brother
Information
Posts: 67
Joined: 24 Sep 2009, 22:34
Has thanked: 211 times
Been thanked: 35 times

Post by x-tn »

kusi wrote:...the power-supply is a bit strange, it's not the best idea to power a 9v linear regulator with 7,5V imho...
Your schematic says "all voltaged measured with 9Vdc power supply."
It looks like it requires AC power. With AC power you would have higher than 7,5V at the regulator input.

User avatar
kusi
Breadboard Brother
Information
Posts: 114
Joined: 15 Aug 2007, 20:45
Has thanked: 2 times
Been thanked: 53 times

Post by kusi »

x-tn wrote:
kusi wrote:...the power-supply is a bit strange, it's not the best idea to power a 9v linear regulator with 7,5V imho...
Your schematic says "all voltaged measured with 9Vdc power supply."
It looks like it requires AC power. With AC power you would have higher than 7,5V at the regulator input.
of course 9vac would make more sense. but the manual clearly states 9V ac OR DC.


thanks apollomusicservice for the values!

User avatar
apollomusicservice
Resistor Ronker
Information
Posts: 338
Joined: 04 Jun 2012, 11:54
Has thanked: 65 times
Been thanked: 828 times
Contact:

Post by apollomusicservice »

kusi wrote: thanks apollomusicservice for the values!
No problem, I just checked values on my pedal.

User avatar
kusi
Breadboard Brother
Information
Posts: 114
Joined: 15 Aug 2007, 20:45
Has thanked: 2 times
Been thanked: 53 times

Post by kusi »

updated schematic w. cap-values:
Attachments
sd driver1.pdf
(34.08 KiB) Downloaded 1172 times

User avatar
apollomusicservice
Resistor Ronker
Information
Posts: 338
Joined: 04 Jun 2012, 11:54
Has thanked: 65 times
Been thanked: 828 times
Contact:

Post by apollomusicservice »

C15=15p

User avatar
kusi
Breadboard Brother
Information
Posts: 114
Joined: 15 Aug 2007, 20:45
Has thanked: 2 times
Been thanked: 53 times

Post by kusi »

is c15 fitted in your version? because in mine it's not (but it doesent really matter if it's 15pF).

thanks for checking!

User avatar
apollomusicservice
Resistor Ronker
Information
Posts: 338
Joined: 04 Jun 2012, 11:54
Has thanked: 65 times
Been thanked: 828 times
Contact:

Post by apollomusicservice »

kusi wrote:is c15 fitted in your version? because in mine it's not (but it doesent really matter if it's 15pF).

thanks for checking!

Under the S/D switch.

User avatar
Cub
Cap Cooler
Information
Posts: 458
Joined: 29 Aug 2011, 07:14
Location: The Netherlands
Has thanked: 102 times
Been thanked: 118 times

Post by Cub »

Quite the power filtering! Almost seems overkill, but that's probably why I'm painting by numbers and the good people at Lehle are designing and building these things to put bread on the table.
Please forgive me if this sounds dumb, but would this filtering be helpful in a Big Muff circuit or an Overdrive / Clean boost to keep the noise down?
I wish I were a chestnut tree, nourished by the sun.
With twigs and leaves and branches and conkers by the ton.

User avatar
FiveseveN
Cap Cooler
Information
Posts: 591
Joined: 25 Oct 2009, 21:20
Location: Romania
Has thanked: 215 times
Been thanked: 116 times
Contact:

Post by FiveseveN »

would this filtering be helpful in a Big Muff circuit or an Overdrive / Clean boost to keep the noise down?
Discrete designs like the more popular Big Muffs have poorer PSRR than something like this, so sure. But what exactly do you mean by "this filtering"? There's a rectifier, smoothing cap(s) and a regulator. Your PSU should already be regulated, but Lehle might not want to take that chance, and that's what the solution is about: flexibility and protection. You can feed it a wide range of voltages with either polarity or even AC and it will work just fine. Interestingly, the "standard" user case where you'd feed it with a proper 9V DC PSU is not the ideal condition, as the others have mentioned above.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)

User avatar
Cub
Cap Cooler
Information
Posts: 458
Joined: 29 Aug 2011, 07:14
Location: The Netherlands
Has thanked: 102 times
Been thanked: 118 times

Post by Cub »

Thank you for your explanation, always eager to learn.
I wish I were a chestnut tree, nourished by the sun.
With twigs and leaves and branches and conkers by the ton.

User avatar
hasanova
Information
Posts: 11
Joined: 25 Apr 2013, 17:12
Has thanked: 5 times
Been thanked: 4 times

Post by hasanova »

Here are some gut shots of a Lehle Sunday Driver SW (it says "Sunday Driver L v1.0" on the PCB). The version without an on/off switch is already traced. One more difference: this one has the TS (True Sound) and TB (True Bypass) switching.
Attachments
Schermafbeelding 2017-07-30 om 19.36.51.png

User avatar
hasanova
Information
Posts: 11
Joined: 25 Apr 2013, 17:12
Has thanked: 5 times
Been thanked: 4 times

Post by hasanova »

One more pic
Attachments
Schermafbeelding 2017-07-30 om 19.37.19.png

User avatar
hasanova
Information
Posts: 11
Joined: 25 Apr 2013, 17:12
Has thanked: 5 times
Been thanked: 4 times

Post by hasanova »

The other side
Attachments
Schermafbeelding 2017-07-30 om 19.36.13.png
Schermafbeelding 2017-07-30 om 20.18.32.png

User avatar
hasanova
Information
Posts: 11
Joined: 25 Apr 2013, 17:12
Has thanked: 5 times
Been thanked: 4 times

Post by hasanova »

With some parts values...
Attachments
Sunday Driver SW - parts.png

User avatar
blacky
Information
Posts: 3
Joined: 12 Feb 2019, 14:33
Has thanked: 3 times

Post by blacky »

Did anyone try the build on this schematic yet?

User avatar
gsb
Information
Posts: 31
Joined: 23 Aug 2008, 01:45
my favorite amplifier: musicman 100b
Completed builds: rangemaster,big muff,sparkle boost,ts 808,gsb drive ,
Location: Starnberg -Germany
Been thanked: 4 times

Post by gsb »

Hi,
I want to try build one for friend -for electric guitar .My question is any options for another ic,s -LM4562 ? or AD823 IC,s.? Newer version work with higher voltage evt. +- 15V to try .
Thanks for help
gsb

Post Reply