BAJA 5E3 Deluxe amplifier overdrive 9v pedal 230218

bajaman · Post by **bajaman** » 28 Feb 2018, 09:40

marcao_cfh wrote:http://www.muzique.com/lab/buffers.htm

There's a similar buffer at this page, but using a mosfet. Let us know how it works, jfets are too much expensive here too.

try Aliexpress

HEAD · Post by **HEAD** » 28 Feb 2018, 14:17

Just ordered 50 pcs 2N7000 for ~1,50US$ at eBay.

287m · Post by **287m** » 28 Feb 2018, 14:34

Hope they came with anti static bag

HEAD · Post by **HEAD** » 28 Feb 2018, 14:56

287m wrote:Hope they came with anti static bag

2N7000 aren't as sensitive to static damage as BS170 in my experience. Datasheet also says they have already a build in protection diode if I recall that correctly. Bigger risk: Are they fake?

Edit: Datasheet of a BS170 also shows a protection diode. So I don't why I had more problems with them.

marcao_cfh · Post by **marcao_cfh** » 28 Feb 2018, 16:06

bajaman wrote:try Aliexpress

I buy alot from Aliexpress

. Didn't got any jfets yet, but got about 100 2N7000. Only problem to not order some jfets now is brazilian customs, the packages arrives from China to Brazil in about 2-3 weeks, and customs takes about 2 months to check and foward the packages. Once it took about 7 months to receive a package

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FeVeR2112 · Post by **FeVeR2112** » 12 Mar 2018, 02:03

marcao_cfh wrote:
bajaman wrote:try Aliexpress
Once it took about 7 months to receive a package .

It is the same everywhere. In Canada, the customs department is so overloaded, it can take 3 to 4 months to get normal mail shipments from Aliexpress. I use the "e-packet" shipping option and it takes 3 weeks instead of 4 to 6 months. Of course, you have to be careful, I have received fake product before...

cbriere · Post by **cbriere** » 14 Mar 2018, 16:45

Helo bajaman

i would be curious the process you used to come up with this circuit?
is it by theorical calculation from the tube circuit to go for the opamp version?
or, with use of Simulation software, SPICE type, and go with components selection that way?
maybe combinaison of the 2 ?
in anycase, good job

thumbs up,

Chris,

Patric2 · Post by **Patric2** » 18 Jun 2020, 15:30

Built this today, 100k volume pot felt like to much volume when maxed. Can i change to a 25k or 50k pot?

And i managed to mix up the 1and 3 lugs on all three pots, ccw fun...

This was my third vero build and i thank you very much bajaman for this sweet 5e3 emulation!

So, bajamans' hiwatt or ac30 next?
Decisions decisions!

FeVeR2112 · Post by **FeVeR2112** » 27 Nov 2020, 22:03

Did up a layout for this schematic with a nod to Kevin at Aion for the off-board rectifier, cap and connections to jacks.

Let me know what you think of the layout and where possible improvements can be made.
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FeVeR2112 · Post by **FeVeR2112** » 28 Dec 2020, 06:58

Maybe its a matter of taste but would the gain and volume pots be better if audio taper?

FeVeR2112 · Post by **FeVeR2112** » 29 Dec 2020, 01:35

I made the PCB as I did above.... the output volume is WAY low - like 10% of unity. I will need to signal trace with the circuit to see what is causing that. I will also triple check my component values since it not without possiblity that something was not the right value.

Post by **modman** » 01 Jan 2021, 18:08

FeVeR2112 wrote: ↑29 Dec 2020, 01:35 I made the PCB as I did above.... the output volume is WAY low - like 10% of unity. I will need to signal trace with the circuit to see what is causing that. I will also triple check my component values since it not without possiblity that something was not the right value.

If you shared the layout transfer, other could build it and help check it. It's probaly in the layout.
It may be a mistake in populating the board, but you probably already checked that.
Please do report back if you find the error. A lot of people will be interested in using the layout.

J

FeVeR2112 · Post by **FeVeR2112** » 01 Jan 2021, 23:01

I have triple checked the layout to the schematic and used the trace tool in the program (Sprint) to ensure the connections were all the way through. I have checked for shorts or solder issues... none found, I also clean my boards after soldering. I have time this weekend to double check the component values.

I am happy to share the layout, Gerber files etc. I have attached the files in a ZIP file.
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Baja 5E3 Deluxe2020.zip: (1.52 MiB) Downloaded 108 times

FeVeR2112 · Post by **FeVeR2112** » 01 Jan 2021, 23:44

The component values based on markings/color bands check out per the schematic. Now to do an audio probe test.

FeVeR2112 · Post by **FeVeR2112** » 05 Jan 2021, 05:46

I also had an enclosure UV print design for this and had it done at Tayda - they somehow printed white when the file clearly had black in the color layer... oh well.... submitted a ticket
[Update: my bad... I did not select that the white was in the color layer... it will be a demo pedal... LOL]

Here is how it looked:
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jhergonz · Post by **jhergonz** » 05 Jan 2021, 13:29

FeVeR2112 wrote: ↑05 Jan 2021, 05:46 I also had an enclosure UV print design for this and had it done at Tayda - they somehow printed white when the file clearly had black in the color layer... oh well.... submitted a ticket
[Update: my bad... I did not select that the white was in the color layer... it will be a demo pedal... LOL]

Here is how it looked:
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IMG_3416.jpg

still looks fine

FuzzMonkey · Post by **FuzzMonkey** » 06 Jan 2021, 10:01

jhergonz wrote: ↑05 Jan 2021, 13:29
FeVeR2112 wrote: ↑05 Jan 2021, 05:46 I also had an enclosure UV print design for this and had it done at Tayda - they somehow printed white when the file clearly had black in the color layer... oh well.... submitted a ticket
[Update: my bad... I did not select that the white was in the color layer... it will be a demo pedal... LOL]

Here is how it looked:
.
IMG_3416.jpg
still looks fine

Ditto.

BAJA 5E3 Deluxe amplifier overdrive 9v pedal 230218 [documentation]