All Star Reverb

[Kipper4]

Here's my perf for Inductions All Star Reverb

It's a great pedal. It does a very good spring type reverb. I love it because finally I have reverb on my tube amp without having to mod the amp by adding a tank.

Features
Damp for the reverb tone
Dwell I used a long decay Belton Brick. The one with the vertical pins
Reverb control the amount of reverb all the way from zero to slap back type




[/URL]

https://imageshack.com/i/eywfSjmOj
Dropbox link
https://www.dropbox.com/s/lwlacvcjv8tvbpn/Photo%2028-11-2014%2017%2017%2000.png?dl=0


Here's the schematic

http://home.comcast.net/~gprause/BuildDocs/All_Star_v2.1.pdf

Mine fits neatly into a 125B

[Mark Hammer]

I'm going to say that you may find some value in being able to tweak the the high end in the feedback signal coming off the "Dwell" control.

Replace R4 (68k) with a 3k3 fixed resistor, 50k pot, and 12-15k fixed resistor - in that order - between C3 and IC1a.  The pot is wired just like the Damp control, but with a .01uf cap between the wiper and ground.

Where the Damp control adjusts the overall hi-freq content for the delay signal, this suggested additional control would control only the tone of the recirculated signal.  Between the two controls you could arrange for reverb that starts out much brighter than it ends up, or reverb that is always a little dull but gets even duller over time.

Note that trimming the high end from recirculated delay tends to make it sound less cluttered.

[Kipper4]

Well thanks Mark.
Nice addition.

[Kipper4]

Heres a crappy demo

https://www.youtube.com/watch?v=TlbXpZ_4-78

[Mark Hammer]

Not crappy at all.  Pretty convincing, actually.

[induction]

Nice build and nice demo. Sounds great!

@Mark: Cool idea. I never thought of that.

[samhay]

Nice one Rich.
I guess you have tried a few of the Belton reverb designs now - is this the pick of them?

[deadastronaut]

cool..

i messed around with this one too...nice verb, but i just had to have tails too....and thanks to sam i have.. 

[samhay]

(not sure if that translates - are dinner jackets still known as 'tails' anywhere?)

[deadastronaut]

only with top hats AFAIK..

cool pic, that's me right now, having caught up on lots of mind nagging jobs

i'm having a well deserved beer n whiskey...

[induction]

cool..

i messed around with this one too...nice verb, but i just had to have tails too....and thanks to sam i have.. 

The All Star has tails, too. At least mine does. On the other forum I show how to wire it for TB or tails. I also show how to wire up a tails/quasi-TB switch.

[deadastronaut]

cool...i never stray from here so i missed it..

[Kipper4]

Thanks Guys for the kind comments it's appreciated. It's a great nice to build circuit.
The first part of the demo is my solid state amp with a tank.
The second part is the All Star. When i remember to turn up the reverb.   Hut hum........ Doh

I wanted to build something that could easily fit in a stomp box with not too many knobs and switches yet have enough variety.
Hence why i built this one.
Sam This is only my second brick build. I couldn't really say if t's my pick. The only other I've built is your super Space and time Reverb
I looked at several schematics and decided on building the because i liked the topolgy more than say, the box of hall.
I couldnt find a layout for perf board (my preferance) so I decided to do my own. which I'm quite happy with especially since the brick sits neatly under the pcb and is just the right thickness to be able to hotmelt glue the pcb back to the pot covers. Saving  space.

I wondered about having enough room for a battery in the enclosure. Hence my reasoning on space saving but it was just too much hassle and since I will only ever use it with a wall wart I decided against the battery idea.
Besides which I wasnt sure how much currant the circuit would eat. I dont want to be replacing batterys all the time.

Quick question while I'm on the subject. What is the expected currant draw on this circuit.
I imagine it's pretty high for a stomper A because its a digital chip. B because In the past when I've daisy chained a pt2399 delay with some other stompers from my power supply (1amp) the delay has crapped out.
At first I wondered If I had a bad cable, bad Amp to speaker cable.
Then It occured it could be lack of currant. Put the Pt2399 on a seperate power supply. Et voila no more problems.

I have now purchased a second brick to experiment some more. Maybe build the flying saucer.IIRC and a few more and try some mods, Thanks for the idea Mr Hammer.
I've redrawn Inductions Schematic in eagle and also with the Hammer mod. and sooner rather than later when I have time. Probably in the holidays now since this is a busy time at work. I'll finish up playing with the reverbs and get down to some more work on the PIAI gator which Is glaring at me from the bread board like a pastrami shouting "Come back and finish me off"

Thanks again guys and sorry for the lengthy reverbating posttttt t  t   t   t    t    t     t     t     t      t      t    t.

[bluebunny]

I have now purchased a second brick to experiment some more. Maybe build the flying saucer.

Yeah, do one of Rob's.  They're pretty cool.  

[samhay]

^What is the expected currant draw on this circuit.

I would expect it will be drawing about 60-100 mA.

[Kipper4]

Thanks Sam.
I guess I should have looked at the data sheet sooner.
To be honest I'm surprised, it's not as bad as I thought.

[Kipper4]

Model #2 done with Mark Hammer mod.
The Dwell damp mod is very subtle. How do i make it less subtle?
What cap size should I go up to or down to?nCurrantly using a 10nf
Thanks
Rich

[Kipper4]

PS
I did make a few additions to Inductions circuit namely:

extra filtering on the 5v regulator (2x100nf caps).
and a protection diode (1N914) across the regulator power rail.

Also I noted after the build I actually used a 4.7uf cap to filter the Vbias instead of a 47uf with no noticable detriment to the reverb.
I ran out of 33 ohms so used a 47ohm again no problem. Again I suspect this could go upto 100ohms without much trouble.
Question is can anyone see a problem with reducing the regulator filter cap down from 220uf to say 100uf ?

Here's the schematic again just in case

http://home.comcast.net/~gprause/BuildDocs/All_Star_v2.1.pdf

[samhay]

The Dwell damp mod is very subtle. How do i make it less subtle?

As Mark described, you have a LP filter with a frequency range of 4.8 kHz to 300 Hz (3k3 - 53k3). If you want more range, drop the 3k3 to 1k and increase the cap to 33n - you get 4.8 kHz  - 90 Hz that way. Might work better with a log pot.

[Kipper4]

Cheers Sam
Now I have Dwell  wiper2 going to the 47nf then to a 3k3>50kb>15K with a 20nf from pot wiper to ground. sounds more noticable to my ears