Build Your Own Clone Message Board

I built this spring reverb kit a couple of months ago.
It worked Wonderfully!!
I was sitting at my computer desk the other day
with this pedal and two others daisy chained and running
into the front of a marshall amp.
While I was playing the guitar, I accidentally knocked
a bottle of water off the desk.
Of course the bottle landed at the power input side of the three
pedals and popped open.
The water got all three pedals Really wet at the power input side.
I immediately turned off the amp etc. and dried off the pedals.
Of the three pedals, the Reverb one Now doesn't work.
It just has a very low volume with a for a lack of a better term
a "Farting Sound"....
I'm wondering if someone may be able to tell me which component
may need replaced in order to get this Great Reverb working again??

Thanks,
Strat1958

Do you have access to a multimeter and know how to use one?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

I do...

thanks.

Test the voltage at pin 1 of the reverb module. You should see 5 volts here. The test pins 8 of both op amps. You should see around 9v here. With the exception of pin 4 on both op amps, which should be 0v because they are connected to ground, you should see around 4.5V on all the other op amp pins.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

Been slow finding time to deal with this pedal...can you tell me what is meant by the OP?

thanks,
Terry

Op amp = operational amplifier, a type of integrated circuit (IC). In the Spring Reverb circuit, there are two of these components used. Specifically, they are dual op amps (i.e. two such amplifiers integrated into a single unit) and are the rectangular black components with 8 legs each, and are inserted into the two 8-pin sockets that are installed as shown on page 9 of the instructions.

Do you have a multimeter and know how to use it?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

thank You for the quick reply! I do have a fluke meter and know how to use the functions I think
would relate to this testing.
Do I need to test with the 9 volt battery installed or the AC Adapter?
I suppose it doesn't matter?

and of course with a plug into the signal in socket??
Thanks, Terry

OK, here's a quick description of what I'd like you to do:

To measure the DC voltage level on the op amp pins, set your multimeter to the DC voltage mode, indicated by a solid line above a dotted one. Use the 20VDC range setting if it's not an auto-ranging meter. Your power source (fresh battery or power supply) needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to each point that you want to measure; take readings on all eight pins of both op amps. Pin 4 of a dual op amp should read 0 volts (ground) and pin 8 should be your power source voltage (nominally 9V). Most of the remaining pins should show about 1/2 of your power source voltage. See left side of the image below for the numbering of the pins. While you're at it, also take a voltage reading on pin 1 of the reverb module; this should show very close to 5.0V to confirm that the 78L05 voltage regulator is working properly. Report all your results here.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Using a Boss AC adapter rated at 9VDC output,

Pedal is put together inside enclosure. Looking at board, with the in and output jacks up...
The upper and to the left op amp-
Pin:1-10.02
2-10.02
3-10.02
4-0V D
5-11.01
6-1.449
7-1.130
8-1.111

The Lower and to the right op amp-
Pin:1-10.02
2-10.02
3-8.93
4-0VDC
5-10.99
6-9.93
7-9.93
8-9.91

Pin 1 of the Reverb Module reads : 4.96 VDC

Thank You,
Terry Harper

OK, the voltage regulator is working, but those two ICs don't look remotely right.

Please remove the two IC's from their sockets (carefully lift them straight up from the socket) and take voltage readings on the sockets themselves. Report those here.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

With IC's Out,

the upper left,

Pin#1-.15 and dropping
2-.24 and dropping
3-9.93
4-0VDC
5-11.02
6-.04 and dropping
7-.006 and dropping
8-.008 and dropping

the lower right,

pin#1-9.98
2-9.90
3-9.04
4-0VDC
5-10.94
6-.98 and dropping
7-.95 and dropping
8-.991

The voltages that are dropping act like a capacitor
discharging i believe.
I wasn't expecting that so the voltages on the upper
left IC Socket started out a little higher than I probably
wrote.

Reverb Module pin#1 Still at 4.96 VDC

The lower right IC seems harder to read the part numbers
that originally...I think...maybe got hot? Maybe my imagination?

thanks, Terry

If those voltage are correct, there seems to be something wrong with your power supply.

Please post pics of your build.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

what do you mean by something wrong with the power supply?
bad nine v battery??
bad ac converter?
This build worked perfect from the first start up for over two months used
almost daily.
Like I said in the first post, a bottle of water spilled onto the input
end This and two other pedals with the other two still working fine.
One of them being a BYOC Classic Compressor.
Not sure what help photos would do if the pedal worked perfect before?

Thanks, Terry

First of all, I suspect that you've wrongly reported the numbering of the pins on the right side of the two IC's. I say this because the power supply connects to pin 8 of the sockets, yet you have reported ~11V on pin 5 in your results with the IC's pulled out. Pin 8 is across from pin 1, not from pin 4. Please review the numbering of the IC on the left side of the following image and confirm or refute my suspicion:



Secondly, photos may be useful since SOMETHING has obviously changed since your water bottle mishap, and there may be visually apparent clues present on one side of the PCB or the other. So we need to see photos of BOTH sides of the PCB. These need to be LARGE, well-lit, well-focused shots that will allow us to see plenty of detail.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

You are correct!
I did those voltages incorrect on the right side of the ic's
I will take new test voltages with the pins numbered
correctly and report back!

Thank You,
Terry

Ok...

These voltages are taken with the same power supply as before
with the pedal turned on....led lit.

looking at pedal open with the in and outputs up.

with IC's installed.

upper left IC.

pin#
1-9.99
2-9.99
3-9.98
4-0V
5-1.116
6-1.134
7-1.444
8-10.97

Lower Rt. IC

pin#
1-10.0
2-10.0
3-8.92
4-0V
5-9.96
6-9.98
7-9.99
8-10.55

Same as before but with IC's taken out.

upper left IC

Pin#
1-2.2 and dropping
2-1.2 and dropping
3-10.07
4-0V
5-0V
6-0V
7-0V
8-11.09

Lower right IC

pin#
1-10.04
2-10.03
3-9.17
4-0V
5-10.05
6-1.3 and dropping
7-1.25 and dropping
8-11.08

Thanks for your help...

Terry Harper

OK, that's progress. Two follow-up items:

First, let me give you the analogous values from my own Spring Reverb which is working perfectly:

With IC's installed:

IC2 (upper left)

1-4.96
2-4.96
3-4.96
4-0
5-1.10
6-1.12
7-1.34
8-9.94

IC1 (lower right)

1-4.96
2-4.96
3-4.47
4-0
5-4.96
6-4.96
7-4.96
8-9.94

With IC's removed:

IC2 (upper left)

1-unstable
2-unstable
3-4.96
4-0
5-0
6-0
7-0
8-9.94

IC1 (lower right)

1-4.94
2-4.94
3-4.51
4-0
5-4.96
6-unstable
7-unstable
8-9.94

Whether the IC's are in or out, pin 8 in a dual op amp should be at your power source voltage and pin 4 should be grounded. Most of the rest generally show 1/2 of the power source voltage unless that half of the op amp isn't being used--this is the case with IC2 and is why the voltages on pins 5 - 7 are so low. The 1/2V is coming from a 50/50 voltage divider in the circuit, formed by the pair of 10K resistors (R16 and R17) sitting next to each other on the far right side of the PCB. This voltage divider connects to pins 3 & 5 of IC 1 and pin 3 of IC2. You can see those voltages in my results with the IC's removed. However, your voltages are staying up near your source voltage, suggesting that either the voltage divider isn't working or that source voltage is bleeding into this part of the circuit somehow.

Could you please take a DC voltage reading on the bottom leg of either of those two 10K resistors and report that here? Also check the voltage on the top leg of the outside 10K resistor--that should be grounded (0V).

Second item: Are those photos coming?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

The Power supply that I'd been using says 9V output,
but I checked it with the meter and it was about 11.8...Wow..
Anyway I found another in my stuff and checked it and I did
this next testing with it . it's putting out about 9.32 V


The Voltage reading at the bottom of either 10K Resisters is: 8.47V

The top right 10K Resistor is 0V
I checked the top left 10K also and it is about 9.32V

I will try and take some pics tomorrow after work,
I've got to figure out how to get them from my phone
too this Forum.

Thank You,
Terry Harper

I would recommend using a photo sharing app like Imgur. You should be able to upload to there and then paste a link in here. Don't worry if the photo doesn't embed in the post; we can either edit your links so they work, or go view the photos offsite.

_________________
Scott

My band, Austin Hollow

High voltage output from inexpensive AC/DC converters is pretty common. But 11.8V isn't high enough to hurt anything. But 9.3V is mo' better!


Hmm, that's interesting. Unless there's something else going on (which is certainly possible), that would indicate that the resistance of the inside 10K resistor of that pair is actually only 1 Kohm. So unless you replaced that resistor with the wrong value after "the flood" (which I assume you would have mentioned), maybe it was partially shorted by the water? If you happen to have a spare 10K resistor around, you might try just replacing that and seeing if your 1/2V reading at the bottom of the resistor pair drops down to around 4.5V where it should be.

Looking forward to seeing those photos....

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

I don't have a spare 10K resister, but I took a reading of it
and it shows about 9K installed. The outside one reads about the same
but slowly climbs to a higher K reading. The inside one that is reading about 9K
also climbs in Ohms..but, VERY Slowly leaving the leads touching the leads
of the resistor.
I'm going to try and send the pics I have taken...would be
easier if you'd let me message them to one of you with my phone.
Thanks, Terry

Photo number 1

photo number 2

photo number 3

Here's why we ask for photos:



The two circled resistors are switched. That's what's screwing up your voltages--instead of the two voltage divider resistors being of equal value (10K each) and giving a 50/50 voltage split, they are in the ratio of 1:10 (10K and 100K), which is exactly why you see 8.47V at the bottom legs instead of ~4.5V. Please switch them and your IC pin voltages should then be correct.

Did you replace these resistors after your water bottle mishap?? Because as the pedal is currently configured, I can't understand how the pedal could have ever worked correctly.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2