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Thats a great idea. You could use either a 1K or 5K pot. Id try the 5K and if there isn't enough variability then go down to the 1K
The input cap is should be fine for a bass. You might want to play with the gain resistor in order to keep the bass "clean"
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I love it! congrats!!! Looks like this was the contest for 386 builders,
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Yeah. Like MeeMaw always said. Don't buy the biscuits when you can make the biscuits But when you aren't expecting company it's nice to know that can of biscuits is there.
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Excellent work! Looks great!
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This project just one a first prize on Instructables!!! Thank you guys! I appreciate the support from all of you in the Instructable community.
You can get away with 1/4W resistors for this build and caps 10 or 15v.
You got some big caps and resistors there! It won't hurt a thing on the circuit. Won't draw any more current. Just takes up more real estate. Look great so far!!
I'd live to be a judge in tech and/or workshopThanks!
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I use DipTrace for my schematics
I have made a new Instructable showing how to build this circuit on a protoboard. The link is here:http://www.instructables.com/id/From-Schematic-to-Protoboard-Building-a-Simple-LM3There is a companion Youtube video showing the entire build. Its kinda long but if you need a step by step this is the place to go:https://youtu.be/7qR-CQzQiWo
From Schematic to Protoboar...View Instructable »
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It also goes step by step how to troubleshoot each step of the build
Ok I have a step by step video I shot this am. I am making another Instructable on step by step how to go from schematic to a radio shack dip board build of this. Same way applies to regular protoboard but I'll prob do one with plain protoboard. Hopefully I'll have it up tomorrow. I'll post here and give links
Ok in the next couple of days I'll do a general Instructable on going from schematic to protoboard. I'll use this amp as the example circuit. What board did you use? The RadioShack DIP protoboard or just a plain protoboard. I'll do one of each but will do the board you are using first
Where are you located. The reason I'm asking is that there is a British company that makes a kit version of this type of amp. They have commented on this Instructable. That may be your best bet and it will help you learn about schematics and guaranty you success. Also if you would like I could make a step by step Instructable on how to wire the amp on a protoboard.
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All the grounds can go to a common point and then to the black (-ve) lead of the battery
Yeah, I had a brain fart. Let me know how it turns out. Post some pics!
Guys. I made an error in the parts list. The output jack is a 1/4" mono switched jack. I mistakenly gave the wrong Switchcraft number. It should be a 12A switch. I have corrected the parts list and have come to terms with my short fallings as human being.
The 66mm speaker will fit a standard Mason (or Ball) jar mouth. In order to drill the holes you need a jar that has smooth sides. So the one you linked won't work because of the quilted sides. You can go with a bigger jar if you can't find the half pint size - no big whoop. I'd think that with the bigger size the sound prob would be even better. You can build it in a bigger jar then transfer it to a smaller when you find one.
That is so cool
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The speaker specs are fine. If you can do arduino, you can do this one. When I look at your breadboard photos everything looks organized well. I think you just have some things hooked up wrong.
Ok. So. Two things I see wrong off the start. You have both ends of the input cap and the input plugged into pin2. You have to chain it across a couple of rows. Input to cap, cap to pin 2. Your output is wrong. I don't think you have the 10ohm resistor plugged into pin 5, I think you're a row off (unless there's jumpers I'm not seeing). Anyways start minimally , test, and then build up from there. Start with power to pin6, 3 and 4 to ground speaker directly to pin 5 and ground. Add 9v, the speaker should pop. Then touch a metal screwdriver to pin 2, it should buzz. If not your chip is shot or in upside down. Then add the guitar input. If that works add the caps and resistors to pin 5 and add speaker. If that works, add gain resistor to pin1 and 8. If that works add the output jack and ...see more »Ok. So. Two things I see wrong off the start. You have both ends of the input cap and the input plugged into pin2. You have to chain it across a couple of rows. Input to cap, cap to pin 2. Your output is wrong. I don't think you have the 10ohm resistor plugged into pin 5, I think you're a row off (unless there's jumpers I'm not seeing). Anyways start minimally , test, and then build up from there. Start with power to pin6, 3 and 4 to ground speaker directly to pin 5 and ground. Add 9v, the speaker should pop. Then touch a metal screwdriver to pin 2, it should buzz. If not your chip is shot or in upside down. Then add the guitar input. If that works add the caps and resistors to pin 5 and add speaker. If that works, add gain resistor to pin1 and 8. If that works add the output jack and power filter cap. You should be good to go. Let me know!!
Yep. It's got a limited audience for sure
Thanks! Have fun making it and then share it on here
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Ive gone ahead and changes the schematic and parts list to reflect use of the more common parts, the 440 ohm resistor and the 220uF caps
Sure. I have one up on my Etsy page. https://www.etsy.com/listing/486308169/mason-jar-guitar-amplifier-jelly-amp?ref=pr_shop
I've gone ahead and changes the schematic and parts list to reflect the more common 220uF cap and the 470 ohm resistor
There may be others but you are truly THE Crafsman
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Thanks! Unless you have a fancy ukulele with a built in preamp you might need a preamp pedal or boost pedal to control the volume and reduce feedback from the piezo pickup.
Here ya go:https://youtu.be/B3UbEohw324
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Johenix1) I use DipTrace. It works well for me. 2) A colored jar would be fantastic! I used a clear jelly jar because that was readily available. 3) I've not seen a perforated lid. I'm sure you could find something that fits. I've thought of using a thermal tumbler like a Yeti or something similar with a clear tight fitting lid. I'd attach the speaker to the lid and drill a series of sound holes. I've even thought of using a snap sealed lid jar from Ikea or the like and do the same thing. I'd love to see what you and others come up with. So get out there and build something!
They are aren't they. And they are strong too.
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