Lehle - Sunday Driver [schematic]
- kusi
- Breadboard Brother
hello my friends,
long time no see, i hope everyone is still alive and doing great?
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
long time no see, i hope everyone is still alive and doing great?
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
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- sd driver.pdf
- (34.02 KiB) Downloaded 731 times
- kusi
- Breadboard Brother
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
viewtopic.php?f=1&t=27364&hilit=lehle
- apollomusicservice
- Resistor Ronker
Information
C2=100n
C6=10u
C12=1n
C13=120p
C14=330p
C15=15p
30-50mA current consumption
C6=10u
C12=1n
C13=120p
C14=330p
C15=15p
30-50mA current consumption
- x-tn
- Breadboard Brother
Your schematic says "all voltaged measured with 9Vdc power supply."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...
It looks like it requires AC power. With AC power you would have higher than 7,5V at the regulator input.
- kusi
- Breadboard Brother
of course 9vac would make more sense. but the manual clearly states 9V ac OR DC.x-tn wrote:Your schematic says "all voltaged measured with 9Vdc power supply."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...
It looks like it requires AC power. With AC power you would have higher than 7,5V at the regulator input.
thanks apollomusicservice for the values!
- apollomusicservice
- Resistor Ronker
Information
No problem, I just checked values on my pedal.kusi wrote: thanks apollomusicservice for the values!
- apollomusicservice
- Resistor Ronker
Information
- apollomusicservice
- Resistor Ronker
Information
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.
- Cub
- Cap Cooler
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?
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.
With twigs and leaves and branches and conkers by the ton.
- FiveseveN
- Cap Cooler
Information
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.would this filtering be helpful in a Big Muff circuit or an Overdrive / Clean boost to keep the noise down?
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)
- Cub
- Cap Cooler
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.
With twigs and leaves and branches and conkers by the ton.
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
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