MXR - Microamp [schematic]
- salocin
- Resistor Ronker
I missed this thread earlier, but going to have to build one now just because Jack put a layout together Nicest part layouts ever!
When are you going to spill the beans on your relay switching Jack?
When are you going to spill the beans on your relay switching Jack?
If you look at the Buf V, you'll see two 9V batteries for ~twice the clean overhead. You will also see that the pedal is not bypassed. It switches between a unity gain buffer, which helps drive the line, and the gain setting. The 70's version of the microamp switched between boost and a load on the signal. I don't know if the new ones are true bypass.dickierex wrote:What are Pauls pet peeves? I've had a Microamp for about 10 years now, and it's been the only pedal to stay on my board in that time - I love it.
While I can hear it color the signal a bit, it has the benefit that any coloring is there boost or buffer, so you can adjust it out at the amp. These Buf pedals were/are very poplular with studio guys in LA. Paul didn't have any real marketing reach at the time, so he moved on to other things. He had a series of them, but I don't recall what the other models did.
Try an LF351 if you have one.
- the3secondrule
- Solder Soldier
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Hey IvIark -
on your layout where it shows a 22m, i'm guessing this is in fact a 2m2 as per the other schems?
I have used your layout as a bssis to do a vero layout to fit in a 1590a - not verified yet. once I've built it I will post it in this thread
Cheers,
Jeremy
on your layout where it shows a 22m, i'm guessing this is in fact a 2m2 as per the other schems?
I have used your layout as a bssis to do a vero layout to fit in a 1590a - not verified yet. once I've built it I will post it in this thread
Cheers,
Jeremy
IvIark wrote:Here's a vero layout I did for some axial components I wanted to use:
There seems to be some differences between the schematic I used and the one Browser posted above. I've got 1K and 10M after the input cap, Browser has 10K and 1M, the voltage divider for Vref I have 2 x 100K, Browser has 75K and 100K, mine has a 15uF from the opamp output compared to 22uF.
Is yours based on the current model Microamp Browser?
"Rock music is mostly about moving big black boxes from one side of town to the other in the back of your car."
- Jack Deville
- Resistor Ronker
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Thank you for the compliment. I'm proud of that MicroAmp layout, and FWIW, it didn't come quickly.salocin wrote:I missed this thread earlier, but going to have to build one now just because Jack put a layout together Nicest part layouts ever!
When are you going to spill the beans on your relay switching Jack?
If you use the layout, please post photos. I'd love to see it built up!
On relay systems:
Sadly, I'm not in a position to expose the double-black-magic-voodoo that makes the Click-Less™ system so quiet. Really though, there are only 12 parts. How complicated could it be?
As I've stated in prior threads, I have quite a bit of development time invested into my commercial circuits. I try to contribute schematics when I can (see "Favorite Pedals You Built" thread for the most recent). The volume of emails I have received requesting schematics and design assistance, and the other competing products available indicate that exposure of the circuit could potentially hinder/cripple/damage my business; although I think a designer will be hard-pressed to come up with a cleaner, faster, smaller solution. Once I am ready to share them, you can all bet this will be the first stop.
- jb351
- Breadboard Brother
A couple pics from my vintage Micro Amp. I picked it up used about 14 years ago.
I don't know if I put the socket in and replaced the opamp or someone else did. I don't remember. It seems like something I would have certainly done as I was just getting started and learning about this stuff back then.
Looking at it's guts again make me nostalgic for the bad old days when there was only 2 main sources of content. R.G.'s and Orman's sites. Which took forever to find on the 1 hour of internet time at school per week. Downloading the info on dial up and printing it out on a Dot Matrix printer (I still have some of the printouts). The only main source of parts were places like Mouser and Digi-Key where I had to mail in or phone in the order, the Canadian Dollar was only worth a little more than half of the U.S. dollar so it all cost way too much and I wait forever for the parts to arrive I could try to solder them in with an old wood burning tool. Anderton's book also cost me $50 and took over a month to arrive back then.
Hmm...After writing this I no longer feel so nostalgic.
I don't know if I put the socket in and replaced the opamp or someone else did. I don't remember. It seems like something I would have certainly done as I was just getting started and learning about this stuff back then.
Looking at it's guts again make me nostalgic for the bad old days when there was only 2 main sources of content. R.G.'s and Orman's sites. Which took forever to find on the 1 hour of internet time at school per week. Downloading the info on dial up and printing it out on a Dot Matrix printer (I still have some of the printouts). The only main source of parts were places like Mouser and Digi-Key where I had to mail in or phone in the order, the Canadian Dollar was only worth a little more than half of the U.S. dollar so it all cost way too much and I wait forever for the parts to arrive I could try to solder them in with an old wood burning tool. Anderton's book also cost me $50 and took over a month to arrive back then.
Hmm...After writing this I no longer feel so nostalgic.
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- IvIark
- Tube Twister
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Sorry Jeremy only just noticed your post. I used the GGG schematic here:
I did think it was high but who am I to question these things so I just left it as shown. I'll change it to 2M2.
I did think it was high but who am I to question these things so I just left it as shown. I'll change it to 2M2.
the3secondrule wrote:Hey IvIark -
on your layout where it shows a 22m, i'm guessing this is in fact a 2m2 as per the other schems?
I have used your layout as a bssis to do a vero layout to fit in a 1590a - not verified yet. once I've built it I will post it in this thread
Cheers,
Jeremy
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- IvIark
- Tube Twister
Information
Here's a more compact version I also did which I've corrected the resistor in.
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- MXR Microamp vero layout
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"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- earthtonesaudio
- Transistor Tuner
Here's something along those lines,roseblood11 wrote:The interesting point of this booster design is that the volume is at unity gain when the pot is turned completely ccw. That makes it easy to add a switch there - so you can switch between booster and buffer modes...
and an improved version.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- the3secondrule
- Solder Soldier
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IvIark wrote:Here's a more compact version I also did which I've corrected the resistor in.
Having seen a few schems in the last few days, there seems to be quite a few with that 22m resistor... could be right after all-
anyway, this is my *verified* layout for 1590a i built it with th 2.2m, but I may try the 22m for the sake of comparison
"Rock music is mostly about moving big black boxes from one side of town to the other in the back of your car."
- the3secondrule
- Solder Soldier
Information
the3secondrule wrote: Having seen a few schems in the last few days, there seems to be quite a few with that 22m resistor... could be right after all-
anyway, this is my *verified* layout for 1590a i built it with th 2.2m, but I may try the 22m for the sake of comparison
noticed something interesting today, when i was messing around with my microamp. it seems to oscillate when the volume is at full, like a high pitched whine - but only in bypass, and happens whether i use battery or wall wart. I used my layout as above, and the only sub was a 22uf instead of the 15uf electro...
any thoughts? its not likely im going to be using this at full volume, so its not really a problem, but it'd be good to figure out whats going on here
"Rock music is mostly about moving big black boxes from one side of town to the other in the back of your car."
- minnow
- Breadboard Brother
I've had a somewhat similar issue with the oscillation, though not with the micro amp.the3secondrule wrote:the3secondrule wrote: Having seen a few schems in the last few days, there seems to be quite a few with that 22m resistor... could be right after all-
anyway, this is my *verified* layout for 1590a i built it with th 2.2m, but I may try the 22m for the sake of comparison
noticed something interesting today, when i was messing around with my microamp. it seems to oscillate when the volume is at full, like a high pitched whine - but only in bypass, and happens whether i use battery or wall wart. I used my layout as above, and the only sub was a 22uf instead of the 15uf electro...
any thoughts? its not likely im going to be using this at full volume, so its not really a problem, but it'd be good to figure out whats going on here
Try to play with your guitar's tone knob - it disappears when I play with mine!!
I am not providing any solution, just adding more questions to the puzzle
- the3secondrule
- Solder Soldier
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Nevermind, i sorted it grounded the board input on bypass. problem solvedminnow wrote: I've had a somewhat similar issue with the oscillation, though not with the micro amp.
Try to play with your guitar's tone knob - it disappears when I play with mine!!
I am not providing any solution, just adding more questions to the puzzle
"Rock music is mostly about moving big black boxes from one side of town to the other in the back of your car."
- the3secondrule
- Solder Soldier
Information
Yeah, i'm really not sure about that one hence the question mark on my layout - but it's on the GGG schem that IvIark used, and also on the pcb that Browers posted...roseblood11 wrote:a 22M pulldown resistor??!?Having seen a few schems in the last few days, there seems to be quite a few with that 22m resistor... could be right after all-
J
"Rock music is mostly about moving big black boxes from one side of town to the other in the back of your car."
- IvIark
- Tube Twister
Information
Sorry, I somehow managed to miss your post here. Cool layout, and I want to put one of these in a 1590A too because I've got a few sitting around doing nothing and it seems a waste to put this in a 1590B size box. I do love 1590A builds, although to be fair I should say I do love love other people's 1590A builds rather than it being me having to cram things in and show patience and drilling accuracy!) Still at least this one only has one pot.
the3secondrule wrote:Having seen a few schems in the last few days, there seems to be quite a few with that 22m resistor... could be right after all-
anyway, this is my *verified* layout for 1590a i built it with th 2.2m, but I may try the 22m for the sake of comparison
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
Hi all!
I resume this topic because I want to ask you something about this pedal.
I'm a novice with this kind of things, I know I've many things to learn, so I ask you to teach me!
Therefore, I've build it with this schematic:
http://generalguitargadgets.com/diagram ... amp_sc.gif
Today, when I was trying it, I've noticed that, when I use the clean amp, the volume of the boost was high when the knob was at 12 o'clock but, when I use the distortion of the amp, the volume of the boost wasn't so high.
When I put the max volume, the pedal is fuzzy and noisy.
It's a problem of the pedal? This pedal may work well only on the clean channel? How can I resolve those problems?
Thanks!
P.S. I'm sorry for my bad english, I hope you can understand
I resume this topic because I want to ask you something about this pedal.
I'm a novice with this kind of things, I know I've many things to learn, so I ask you to teach me!
Therefore, I've build it with this schematic:
http://generalguitargadgets.com/diagram ... amp_sc.gif
Today, when I was trying it, I've noticed that, when I use the clean amp, the volume of the boost was high when the knob was at 12 o'clock but, when I use the distortion of the amp, the volume of the boost wasn't so high.
When I put the max volume, the pedal is fuzzy and noisy.
It's a problem of the pedal? This pedal may work well only on the clean channel? How can I resolve those problems?
Thanks!
P.S. I'm sorry for my bad english, I hope you can understand
Apparently my info is missing perhaps a copyright-based deletion. I posted a schematic and layout for the current version unlike what you have seen. PMSetzer-Lynch wrote:Hi all!
I resume this topic because I want to ask you something about this pedal.
I'm a novice with this kind of things, I know I've many things to learn, so I ask you to teach me!
Therefore, I've build it with this schematic:
http://generalguitargadgets.com/diagram ... amp_sc.gif
Today, when I was trying it, I've noticed that, when I use the clean amp, the volume of the boost was high when the knob was at 12 o'clock but, when I use the distortion of the amp, the volume of the boost wasn't so high.
When I put the max volume, the pedal is fuzzy and noisy.
It's a problem of the pedal? This pedal may work well only on the clean channel? How can I resolve those problems?
Thanks!
P.S. I'm sorry for my bad english, I hope you can understand
- Steven_M
- Resistor Ronker
Bad or backwards cap? Check the orientation.lukatosh wrote:I built this pedal today but i have a problem... when i press the 3pdt the effect take a time to start working...
What can be wrong?