All-Star Reverb

Stompboxes circuits published in magazines, books or on DIY electronics websites.

Re: All-Star Reverb

Postby destro » 18 Sep 2013, 15:49

Thanks for posting the wet mod! I've been wanting to add a dry level pot for wet only, but have had problems with the wet level being lower than unity volume. Maybe with this mod it will work better. Also gotta get the tails going.
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Re: All-Star Reverb

Postby induction » 18 Sep 2013, 16:35

That's an interesting idea. It seems like you could swap R11 for a 50K pot wired as a VR. That should give you control over the dry gain without affecting the wet gain. I haven't tried it though, so I can't promise it will work. Let me know what you come up with.

I think the tails are totally worth it, by the way.
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Re: All-Star Reverb

Postby destro » 27 Sep 2013, 03:27

induction wrote:That's an interesting idea. It seems like you could swap R11 for a 50K pot wired as a VR. That should give you control over the dry gain without affecting the wet gain. I haven't tried it though, so I can't promise it will work. Let me know what you come up with.

I think the tails are totally worth it, by the way.


With the wet mod it works fantastically. I wired the 50k log backwards for best results. With the brick soldered in I had to cut resistors and run series to get the wet values. It is starting to look a bit frankensteinish in there!

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Re: All-Star Reverb

Postby Herec » 27 Sep 2013, 17:06

What are "the tails"?
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Re: All-Star Reverb

Postby induction » 27 Sep 2013, 18:58

"Tails" means that when you turn off the reverb by stomping the switch, the decay continues and fades out naturally instead of cutting off abruptly. Any signal introduced before the stomp will continue to reverberate, any signal introduced afterward will not. This is useful if you turn the reverb on and off in a performance. If you leave it on all the time, there's no difference. To get tails, you have to forego true bypass, though you can rig up a switch to select between tails and true bypass.

I didn't bother with the tails/TB switch. I just wired it up with buffered bypass. In the breadboarding stage, I couldn't hear any difference between buffered and true bypass on the original version (I didn't try the wet mod). With the BYOC 2-knob, on the other hand, I got audible bypass hiss with buffered bypass. I think that's because the BYOC has the reverb gain cranked way up.

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Re: All-Star Reverb

Postby ilearn » 11 Oct 2013, 06:27

It sounds very promising.
I made GGG reverb, but wanted something little bit more.
I'll report back once I finish the build.
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Re: All-Star Reverb

Postby ilearn » 19 Oct 2013, 11:40

Just built one.
It is so much better than GGG reverb and D-verb. Many thanks to 'induction'.
I put the pedal in between the pre and power amp and I don't get any kind of noise at all.
When I made the D-verb, I didn't use the damp knob at all, now I do understand why we need damp knob.

The only small issue is in bypass mode (I chose buffered bypass with tails) I still hear little bit of reverb sound leaking.
Anyone experiencing the same?

Again Huge applauds to 'induction'!!!
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Re: All-Star Reverb

Postby ilearn » 24 Oct 2013, 01:03

Just noticed that there is a pop noise when I engage the foot switch.
I didn't notice the noise until I finished the offboard wiring and casing.

I disconnected the Vref from the foot switch and the noise is gone.
Is it okay to disconnect the Vref?

Any comments?

Thanks in advance
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Re: All-Star Reverb

Postby induction » 24 Oct 2013, 15:33

I'm glad you like it.

You can leave Vref off of the switch if it helps. I am surprised that it pops with it but not without it because preventing pops is the only reason the switch is connected to Vref. Point A is held at Vref by the op amp, so we want point B held there in bypass to avoid rapid DC shifts during switching that would create pops. Mine pops with Vref disconnected and doesn't pop when Vref is connected.

Are you still getting wet signal leaking in bypass? If so, those two issues may be related. It sounds like a possible short (solder bridge, failed track cut, etc).

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Re: All-Star Reverb

Postby ilearn » 25 Oct 2013, 03:44

induction wrote:I'm glad you like it.

You can leave Vref off of the switch if it helps. I am surprised that it pops with it but not without it because preventing pops is the only reason the switch is connected to Vref. Point A is held at Vref by the op amp, so we want point B held there in bypass to avoid rapid DC shifts during switching that would create pops. Mine pops with Vref disconnected and doesn't pop when Vref is connected.

Are you still getting wet signal leaking in bypass? If so, those two issues may be related. It sounds like a possible short (solder bridge, failed track cut, etc).


Yes, I still get wet signal leaking.
I'll build one more for my friend and see if there's any difference.

Thanks!!!
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Re: All-Star Reverb

Postby emerkel » 25 Oct 2013, 23:25

heyy, noticed something that may or may not be an issue. the 1M pull down resistor is shown on the vero as wired to the regulator ground but it should be on the external ground according to the schematic (and looking at most other belton brick designs) maybe it doesn't make a difference? just curious. demos sound great!
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Re: All-Star Reverb

Postby ilearn » 01 Nov 2013, 10:07

I believe MALEKKO SPRING CHICKEN REVERB has expression pedal jack.
Can we add one to out fabulous All-Star Reverb?

Can Induction help me?

:)
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Re: All-Star Reverb

Postby ilearn » 04 Nov 2013, 07:20

ilearn wrote:
induction wrote:I'm glad you like it.

You can leave Vref off of the switch if it helps. I am surprised that it pops with it but not without it because preventing pops is the only reason the switch is connected to Vref. Point A is held at Vref by the op amp, so we want point B held there in bypass to avoid rapid DC shifts during switching that would create pops. Mine pops with Vref disconnected and doesn't pop when Vref is connected.

Are you still getting wet signal leaking in bypass? If so, those two issues may be related. It sounds like a possible short (solder bridge, failed track cut, etc).


Yes, I still get wet signal leaking.
I'll build one more for my friend and see if there's any difference.

Thanks!!!


I made one more over the weekend. No leakage, no popping, no nothing!
Thanks again 'induction'!
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Re: All-Star Reverb

Postby induction » 11 Nov 2013, 18:44

ilearn wrote:I believe MALEKKO SPRING CHICKEN REVERB has expression pedal jack.
Can we add one to out fabulous All-Star Reverb?

Can Induction help me?

:)


I don't have any experience with expression pedals, but on this page at geofex, RG describes a very simple method for replacing a pot with an expression pedal, as long as the pot being replaced is wired either a) as a variable resistor (ie with two of the lugs jumpered) or b) as a voltage divider with one lug to ground. The only pot in the All-Star Reverb that fits this criterion is the dwell pot, which is wired like b). So you can use RG's method to control the dwell control with an expression pedal because lug 1 goes to ground, but you can't do this for the reverb control because lug 1 goes to Vref. RG's method employs stereo cables and a switchable (closed-circuit) stereo jack for the expression pedal send, and it will give control back to the pots when the expression pedal is unplugged from the reverb pedal.

RG mentions in the link that there is a way to replace pots wired as voltage dividers without any grounded lugs with expression pedals (it involves optocouplers), but he doesn't spell it out in detail. Alternatively, it could be done with switchable 4-connector jacks and cables in a simple extension of the method described in the link. Stereo headphones with built-in microphones (like those used with mobile phones) have 4-connector cables that you could use, but I don't know where to find switchable 4-connector jacks.

On the other hand, if you wanted to permanently replace the reverb control with an expression pedal, that's easy enough to do, but not as desirable, I would think.
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Re: All-Star Reverb

Postby thomasdf » 15 Nov 2013, 11:32

probably my next build!

I've been waiting so long for a reverb like this... Great job!
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Re: All-Star Reverb

Postby brwifrbo » 22 Nov 2013, 12:05

Just built this up today. Fantastic sounding verb. I replaced the 100K resistor with a trimmer cos it seemed to be much louder than unity gain when the effect was on. I seem to have a popping issue though. Tried upping the pulldown resistor to 4.7m but she still pops. Wired up the switch so it sends the circuit input to ground on bypass as well. Anyone had the same issues?
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Re: All-Star Reverb

Postby ilearn » 25 Nov 2013, 07:35

brwifrbo wrote:Just built this up today. Fantastic sounding verb. I replaced the 100K resistor with a trimmer cos it seemed to be much louder than unity gain when the effect was on. I seem to have a popping issue though. Tried upping the pulldown resistor to 4.7m but she still pops. Wired up the switch so it sends the circuit input to ground on bypass as well. Anyone had the same issues?


I had the same issue. I took the Vref off from the swith and the pop noise was gone.

Few days later, I made the same unit for my friend Vref connected to the switch, but this time no popping issue at all.
I guess I need to blame the veroboard and poor soldering skills...
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Re: All-Star Reverb

Postby ilearn » 25 Nov 2013, 07:46

I tried the All-star reverb at my friend's rehearsal with 100 watts amp and experienced slight gainish sound on wet signal.
The gainish sound becomes clearer when I pick the string hard.
I didn't notice this since I usually play with slight crunch or driven sound.
But when I played the guitar with clean amp setting, I can tell the wet signal is not clean and somewhat cloudy sounding.

induction, please shed a light for me.

Thanks.
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Re: All-Star Reverb

Postby induction » 25 Nov 2013, 17:09

brwifrbo wrote:Just built this up today. Fantastic sounding verb. I replaced the 100K resistor with a trimmer cos it seemed to be much louder than unity gain when the effect was on. I seem to have a popping issue though. Tried upping the pulldown resistor to 4.7m but she still pops. Wired up the switch so it sends the circuit input to ground on bypass as well. Anyone had the same issues?


Did you do true bypass or buffered bypass with tails?

ilearn wrote:I tried the All-star reverb at my friend's rehearsal with 100 watts amp and experienced slight gainish sound on wet signal.
The gainish sound becomes clearer when I pick the string hard.
I didn't notice this since I usually play with slight crunch or driven sound.
But when I played the guitar with clean amp setting, I can tell the wet signal is not clean and somewhat cloudy sounding.

induction, please shed a light for me.

Thanks.


What was your signal chain?
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Re: All-Star Reverb

Postby ilearn » 26 Nov 2013, 04:16

induction wrote:
ilearn wrote:I tried the All-star reverb at my friend's rehearsal with 100 watts amp and experienced slight gainish sound on wet signal.
The gainish sound becomes clearer when I pick the string hard.
I didn't notice this since I usually play with slight crunch or driven sound.
But when I played the guitar with clean amp setting, I can tell the wet signal is not clean and somewhat cloudy sounding.

induction, please shed a light for me.

Thanks.


What was your signal chain?


From guitar to amp. I didn't use any pedals. The reverb was in the effect loop of the amp.
I put the reverb pedal in front of the amp and I hear the same sound.
I wired my reverb pedal as buffered bypass with tail.

Thanks.
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