Author Topic: tiny tremoloOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO (Read 363869 times)

sed · « **Reply #460 on:** January 31, 2011, 05:02:43 PM »

Quote from: deadastronaut on January 30, 2011, 11:23:12 PM

whoooooo.....cheers jace, i'll give it a go.....whooooooo.......

bingo, full house!...

the 3mm led on the board is the rate led..that will go in the top of the box...always on

so theres 2 leds on the box , speed, and on/off...coz i'm greedy...

like this?

I've been reading this thread with interest...
Do you still keep signal ground and power ground separated? If so, the drawn switching of the status LED won't work. The led has to be connected to power ground. Just tie the ground lugs of input jack and output jack together without going to the switch. Replace signal ground on the switch with power ground.

Daniel

phector2004 · « **Reply #461 on:** January 31, 2011, 05:14:31 PM »

With input jack power switching, the case will be grounded.

deadastronaut · « **Reply #462 on:** January 31, 2011, 06:55:08 PM »

ok heres the final layout. i think...

with added led/resistor too...loads of leds....

my secretary will print up the pcb of it...tomorrow...and its still tiny...

@phil, i tried various 555's..and they definately arent as good/stable as the cmos....stick with them ok..i tried 4 different ones
one thing i noticed in particular was the 'normal 555's were faster speed wise...than the cmos...just swapping them over..no knob twiddling etc...
but were noisier definately....the cmos is quiet as a mouse...great!...so cmos it is ok guys....

also i was checking around and found these low power ones...what do you think of these for this?...or stick with the standard cmos555..?
http://pdf1.alldatasheet.com/datasheet-pdf/view/25485/STMICROELECTRONICS/TS555.html

Jhouse · « **Reply #463 on:** January 31, 2011, 07:33:19 PM »

The layout looks just fine to me.

I think it would be pretty nice if could power that bad boy with one of THESE or something of the like. As it is right now, I think that bad boy is small enough to fit into an altoid's case with a 9v battery so just having a small battery would just be flashy, but the smaller the better, right?

deadastronaut · « **Reply #464 on:** January 31, 2011, 07:35:47 PM »

yeah right...it could be built into a guitar even......hmmmm......would have to lose a couple of leds though...

Jhouse · « **Reply #465 on:** January 31, 2011, 07:37:22 PM »

Quote from: deadastronaut on January 31, 2011, 07:35:47 PM

yeah right...it could be built into a guitar even......hmmmm......would have to lose a couple of leds though...

Lose LED's? Nonsense! Make that guitar SUPER flashy.

deadastronaut · « **Reply #466 on:** January 31, 2011, 07:43:55 PM »

yeah lets rarrrrrk...

..ive been messing around with different colour leds today as it happens...

not with the ldr setup though...thats hi bright red...not super..but better than the usual diffused....

i tried supers but its too low voltage to kick em in..

phector2004 · « **Reply #467 on:** January 31, 2011, 07:45:12 PM »

Paul Marossy's site has a cool onboard preamp that uses a compact 12V battery. You could probably power this thing with one of those... battery's about 1" in length, 1cm diameter and can probably keep this running for a bit.

markeebee · « **Reply #468 on:** February 01, 2011, 02:40:54 AM »

Ah crapsocks! I etched some boards last night, but didn't check this thread so I missed Rob's latest tweak. Guess I'll do more tonight. Arse.

deadastronaut · « **Reply #469 on:** February 01, 2011, 06:40:45 AM »

@mark ooooops.....feck...

deadastronaut · « **Reply #470 on:** February 01, 2011, 06:55:26 AM »

hi mark, yeah its all sorted now...seems obvious now to drop the voltage on the 555...dont know why i didnt think of it before... $:-\$

thats what comes of only having a 9v psu...

oh well...all better now!...

faptdivers · « **Reply #471 on:** February 01, 2011, 08:20:51 AM »

So does the voltage sag cure the ticking on a regulat 555 to? Or is it just for the cmos version.

earthtonesaudio · « **Reply #472 on:** February 01, 2011, 08:38:42 AM »

Quote from: faptdivers on February 01, 2011, 08:20:51 AM

So does the voltage sag cure the ticking on a regulat 555 to? Or is it just for the cmos version.

The same principle works on both chips, however the bipolar 555 draws more current, so by the time you have introduced enough series resistance to isolate the oscillator power from the audio section's power, you've dropped too much voltage and the 555 no longer oscillates.

deadastronaut · « **Reply #473 on:** February 01, 2011, 08:51:53 AM »

^cmos only...others are noisey..try them andsee/hear the difference...

@alex.

what's your opinion on these low power ones...would they be more suitable for the lowered voltage?..

http://pdf1.alldatasheet.com/datasheet-pdf/view/25485/STMICROELECTRONICS/TS555.html

deadastronaut · « **Reply #474 on:** February 03, 2011, 09:44:03 AM »

etched my box today..and a few pcbs..

the yellow speed led is going in the middle of the atomic symbol...on/off red leds will be three little outer nodes...i love an led or 4..ha ha...

ive got hold of some of those low powered ts555cn's..cmos..i'll try those later and post my results.

look at my knobs...

Jhouse · « **Reply #475 on:** February 03, 2011, 10:29:17 AM »

Nice Rob. It looks pretty stinkin' good to me. Watch out though! I've been working on my tremolo idea to make one even smaller than yours.

deadastronaut · « **Reply #476 on:** February 03, 2011, 10:31:53 AM »

Quote from: Jhouse on February 03, 2011, 10:29:17 AM

Nice Rob. It looks pretty stinkin' good to me. Watch out though! I've been working on my tremolo idea to make one even smaller than yours.

what a 1590a?....

btw guys, i tried the low powered ts555's. great!...very suitable...

Jhouse · « **Reply #477 on:** February 03, 2011, 01:48:18 PM »

Quote from: deadastronaut on February 03, 2011, 10:31:53 AM

btw guys, i tried the low powered ts555's. great!...very suitable...

Awesome! I'll have to give those a look at too.

earthtonesaudio · « **Reply #478 on:** February 03, 2011, 01:59:06 PM »

Quote from: deadastronaut on February 01, 2011, 08:51:53 AM

^cmos only...others are noisey..try them andsee/hear the difference...

@alex.

what's your opinion on these low power ones...would they be more suitable for the lowered voltage?..

http://pdf1.alldatasheet.com/datasheet-pdf/view/25485/STMICROELECTRONICS/TS555.html

I don't know about those other chips. The key is not low voltage operation but low current. Two circuits sharing a common power supply act as a current divider, so if one is drawing large spikes of current it will steal from the other, and you'll hear that as a pop.

The way to fight this problem, generally, is with power supply decoupling and bypassing. You want some generous bulk capacitance for the power supply once it's inside the enclosure, each separate circuit ought to have its own bypass cap, and there should be an RC filter in the power wire between the noisy circuit and the sensitive one.

The low current draw of the CMOS part makes the job easier because you can use a bigger resistor without dropping too much voltage.

deadastronaut · « **Reply #479 on:** February 03, 2011, 07:25:14 PM »

pcb done..

edit:

am so glad to finally get this off my breadboard at last........now i can get on with my next 'tiny project'....

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Author Topic: tiny tremoloOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO (Read 363869 times)