TREMSHIFTER

[Maik]

Yo!
Happy birthday to her, happy birthday happy birthday mrs Deeheee...

[Jdansti]

 

[John Lyons]

So something like the 9203 here for the photo cells , Rob? http://www.smallbearelec.com/servlet/Detail?no=711
I've got it fired up and working but with the Vactrols I 'm using (Vactec VTL5C2 ) the effect is weak with both the Trem and Filter sections.

[deadastronaut]

Hi john, are you using the recommended leds on page 1?.
including the 3mm sb clear orange, 5mm green,blue too.


as they will make a difference, especially on the filter...

im still not home till thursday, but i will re,measure the ldrs i used ok.

[John Lyons]

 
The units I'm using are these because I had them here.
I'm using orange diffused LEDs as I can't stand super brights visually.
I'll have to get my hands on some others just to get this working
and then deal with the visuals later.

[deadastronaut]

My superbright 3mm's aren't really that bright...even my red on/off 3mm i stuck a 10k on, and its fine, not retina destroying at all..

but you can always diffuse them with a little rub of wet n dry..

when i tried standard diffused leds ,  on breadboard the effect was also weak IIRC...

[deadastronaut]

ok guys i'm back from up north..been a hectic 2 weeks for me and especially mrs astro..

but all sorted now..

i'll be picking up the pcbs  from post office today...and have ordered a bunch of proper jiffy bags as a couple of guys had issues with envelopes.. 

they will be arriving on tuesday...so i'l do a blitz post out then ok.

meanwhile i'll go through the pcb requests in order to be fair and notify you ok...



due to the unforseen high number of requests i have had to order more pcbs, so if you don't get notified this week, you will when the next batch arrives ok.

cheers guys, rob

(@kevin i'll send yours out asap ok. )

[deadastronaut]

ok, just had a count up in order, and ALL requests will be catered for ok guys.....

message you all later ok. 

[John Lyons]

I got it all working now. Sounds good.
I used Smallbear's 5mm 9203 LDRs and super bright
(water clear) Blue and Green LEDs (just like Rob said  ) and
everything is as it should be. Thanks Rob!

[deadastronaut]

Brilliant, nice one man....

did you swap c10 for a 47uf for longer filter sweeps?..

[John Lyons]

I actually like the faster bubbly sweep it gets now.
It gets pretty slow as is so I kept it to the schematic/layout.
I may even try to get the sweep faster just to see how it is.
I kind of wish I could adjust the spacing between cycles and keep
the same depth and speed. Might have to take a look at the tremulus
lune and see what's going on there.

[deadastronaut]

note: all pcb orders will be sent out today ok guys..

[midwayfair]

I actually like the faster bubbly sweep it gets now.
It gets pretty slow as is so I kept it to the schematic/layout.
I may even try to get the sweep faster just to see how it is.
I kind of wish I could adjust the spacing between cycles and keep
the same depth and speed. Might have to take a look at the tremulus
lune and see what's going on there.

Hey, John, you can adjust the duty cycle by varying the biasing on the oscillator's op amp - R1 and R2. Right now they provide an even split. If you lower either one, you can offset the wave. I think the Lune just turns one of them into a pot, but you could also probably stick a couple 47Ks in series with lugs 1 and 3 of a 250K pot, connect the wiper to pin 3 of the op amp, and get a pretty big range that way, even though it's a couple extra parts.

[John Lyons]

Thanks Jon. I'll look into that.

After playing with it a bit more I would also like to keep the
Speed and Depth of the filter but lessen the amount/intensity of
the filtered signal. Same rate and sweep but less of it in relation
to the clean signal. Would that be a matter of altering R11 at the first
op amp/filter stage. Less resistance I guess.

[hangingmonkey]

Received my pcb in the post yesterday, thanks rob

[petey twofinger]

mine is runnin great , stock with tl072's . orange ( not ultra bright ) 3mm indicators , ultra blue / green leds with tayda cds cells .   i did try some of the cheap EG  vactrols i had , but ... they all work , they just didnt have low enough impedance , i think 40 k ish was as low as i had .

not sure about what c10 i may go stock tried ten 22 and 47  .  i played thru a hacked hodad amp with a trem and delay , synching all that up ,  wow , i was doing that for two hours .

i did put in a 22nf instead of a 22pf .... thats what i get for not organizing my bom better , i also mis-polaritied the indicator led wires , and cut in an on/on for the cap switch , man did i do my best to screw this one up ! oh well , 11 hours later , its runnin . lol . the only mod i would think of would be adding an additional fine control pot , but , i blew my chicken salad up trying that once ... more monkey time is in order .

thanks Rob , for your work and the pcb was very nice too .

[deadastronaut]

hi guys..i got fed up with typing untold messages back n forth, so decided to add a page to my site to make life simpler for me, and you...


http://deadastronaut.wix.com/index#!__build-your-own-pedal

[deadastronaut]

BOM for the tremshifter

[bean]

I built mine up and it sounds super. I ended up making the Filter Depth 500k instead of 100k. I did not have the spec'd photocells or LED's but came up with acceptable alternates. I tried 8002 and 9203 from SMB on the cells and ended up with 8002. For LED's, I used 3mm all around:
Trem: red diff for the indicator, clear bright for the LFO
Filter: clear bright for the indicator, one called "hyper orange" for the LFO

It's very quiet, too...not a peep of noise or ticking. Excellent work there, Rob!

[deadastronaut]

Cool, glad you got it going Brian...excellent.

Was you tempted to change C10 to a 47uf for a nice slow filter sweep.?.,

I did it to mine, it sacrifices high speed, but I'm fine with That...