I'm building a Combo Amp for someone.

The cabinet is Pine 13" wide x 15" tall and 11" deep. All glued together and used a 1/2" roundover bit in my router for the edges.

The speaker is a vintage 10" Utah 15W 8ohm. The amp is my dual Im386 chip bridged amp design. Can run on 9volt battery or walwart and output is 1 to 2 watts.

Views: 2582

Replies to This Discussion

" In local news, a number of residents claim they heard profanities coming from a neighbor's house. One person also claimed to have seen a cat flying out of a window of that house".

Like one of those Loony Tunes when you see a cat flying through the air with it's behind arched higher that it's body and a kicking foot behind it.

It was tempting, but I don't do that to animals even if they make me want to sometimes. LOL

The wife did ask what was wrong from a couple rooms over and mentioned something about language.

Yes, but clear packing tape would be better. It's stickier and tends to split when you try to take it off. LOL

It's repairable.

Speaker has shipped. The anticipation builds.  A cat is seen wandering around meowing waiting for another speaker to trash.

Speaker arrived.

Yes it was fast, but it didn't have to travel far. They are located in Paducah, KY.

Dang Gremlins. I got the speaker in and now the amp starts acting up. There's way too much noise in this amp and I think it's because the components are too close together on the board. So I've taken the board out, removed all the components and started over with some space between the components.

Also, I'm going to have to go back to 1 input because it's just causing to many problems with the chips. I'm also going back to 1 volume pot controlling both chips because both end up all the way out anyway so I'll need to make another control board.

Basically I'm reverting back to the original design that I did when I made mine because it worked without issues. It will have a switchable cap choice on the input channel, but only be able to use one thing at a time on this amp.

I'm thinking that isolation diodes in the output circuit would be needed to keep signal from creeping into the other board.

The problem I'm having is that both circuit's Jfets end up being tied together in the power section and they are too close together. So I just have to go back to a known good circuit.

Step away from the duct tape. Haha

So I rewired the board and made a new control plate.

It seems that the IM386N1 chips are bad. I've used the N1 on Ruby amps without issue and they were available locally at Radioshack, My original dual chip amp that I built suffered damage from power polarity reversal, but this build should still be working since there wasn't an issue with reversed power polarity. I'm beginning to believe that the N1 chip isn't well suited to this dual chip amp. 

In a couple of weeks I'm going to order some N3 chips and give them a try. Hopefully they will be better than the N1's.

So true, I have had a few of a batch of IC chips test bad/not work properly.

Might be the right choice to get the N3's, simply for the higher output (700mW per IC for the N3 versus 325mW for the N1).

Hope it works for you.

RSS

The Essential Pages

New to Cigar Box Nation? How to Play Cigar Box GuitarsFree Plans & How to Build Cigar Box GuitarsCigar Box Guitar Building Basics

Site Sponsor

Recommended Links & Resources


Discussion Forum

Tribute amps I've built

Started by Tom Hoglund Nov 7, 2022. 0 Replies

LM386 Amp w/ Switchable Clean Channel

Started by BrianQ.. Last reply by BrianQ. May 28, 2021. 1 Reply

Simple 1st Timer CBG Amp

Started by BrianQ.. Last reply by BrianQ. Sep 27, 2020. 25 Replies

Matching Speakers to LM386

Started by Southern Ray. Last reply by Southern Ray Aug 6, 2020. 11 Replies

Suggestions wanted for easy amp build

Started by Southern Ray. Last reply by Southern Ray Jun 15, 2020. 11 Replies

Ruby Amp

Started by BrianQ.. Last reply by Southern Ray May 16, 2020. 27 Replies

Low-Z pickup and components values

Started by Southern Ray. Last reply by Southern Ray May 13, 2020. 6 Replies

Oops

Started by Southern Ray. Last reply by Southern Ray May 2, 2020. 12 Replies

DIY Spring Reverb

Started by Kevin Keating. Last reply by Paul Craig Oct 17, 2019. 4 Replies

TDA2030A Amp

Started by Bama Hound. Last reply by Gary Stenzel Jul 23, 2017. 14 Replies

Home Brew Champ Tube Amp

Started by Scott aka Farmer Ted. Last reply by Paul Craig Feb 6, 2017. 3 Replies

Dual IM386 Chip amp

Started by Paul Craig. Last reply by Paul Craig Jan 26, 2017. 29 Replies

5 Watt Amp Kit (DIY Case)

Started by Walter Haapapuro. Last reply by Gene Jones Dec 7, 2016. 46 Replies

DIY reverb behold - I found this online

Started by Danny B.. Last reply by Paul Craig Nov 2, 2016. 3 Replies

Bass Cabinet project

Started by Murdoc_420. Last reply by Murdoc_420 Jul 15, 2016. 34 Replies

Kalamazoo Model 1 Deluxe

Started by Scott aka Farmer Ted. Last reply by Rick Alexander Jun 20, 2016. 12 Replies

LM386 amp and other stuff

Started by Denis U. Last reply by Denis U May 29, 2016. 19 Replies

Latest Activity

A.D.EKER commented on Dar Stellabotta's video
Thumbnail

A Cigar Box Guitar Six Stringer Built by Louie Lamanna

"i See Your ready to Blow away the GRAND STADIUM ! tree strings more of DAR DELIGHT !! Shine Girl !…"
4 hours ago
A.D.EKER commented on A.D.EKER's video
Thumbnail

Im Troubled (Tribute) Mc K Morganfield by BCB - A.D .Eker 2024.

"Thank you for the kind comments Doug! Glad you liked the Picture !"
5 hours ago
BrianQ. commented on Dar Stellabotta's video
9 hours ago
BrianQ. liked Dar Stellabotta's video
9 hours ago
Southern Ray commented on Southern Ray's photo
Thumbnail

Project Punch!

" Thank ya again Keith!"
11 hours ago
Southern Ray commented on Southern Ray's photo
Thumbnail

Punch Project!

" Thank Ya Keith!"
11 hours ago
Doug Thorsvik commented on AGP #'s photo
Thumbnail

AGP #527 - ''Led-Zep 2''

"This build really strung you along Alan! Reminded me of all my fishing line experiments; a lot of…"
13 hours ago
Doug Thorsvik commented on A.D.EKER's video
Thumbnail

Im Troubled (Tribute) Mc K Morganfield by BCB - A.D .Eker 2024.

"Diggin’ the slow blues. I like that last pic Andries! Look at all those cool guitars. Yeah!!!"
13 hours ago
Dar Stellabotta posted a video

A Cigar Box Guitar Six Stringer Built by Louie Lamanna

This video is the unboxing and the demonstration of a beautiful, six stringer built by Louie Lamanna. Join Louie and I June 15 at the second annual Pittsburg...
14 hours ago
Doug Thorsvik commented on Doug Thorsvik's video
Thumbnail

Hail the Resurrection Day: 2-String Violin Chugger Cigar Box Guitar

"Happy Easter to you too Andries! The passion is definitely in full swing. Turns out I’m…"
15 hours ago
A.D.EKER commented on Doug Thorsvik's video
Thumbnail

Hail the Resurrection Day: 2-String Violin Chugger Cigar Box Guitar

"Happy Easter Doug ! the Passion is in full swing !"
15 hours ago
A.D.EKER commented on Ricky D's photo
15 hours ago

Music

© 2024   Created by Ben "C. B. Gitty" Baker.   Powered by

Badges  |  Report an Issue  |  Terms of Service

\uastyle>\ud/** Scrollup **/\ud.scrollup {\ud background: url("https://storage.ning.com/topology/rest/1.0/file/get/963882636?profile=original") no-repeat scroll 0 0 transparent;\ud bottom: 25px;\ud display: inline !important;\ud height: 40px;\ud opacity: 0.3 !important;\ud position: fixed;\ud right: 30px;\ud text-indent: -9999px;\ud width: 40px;\ud z-index: 999;\ud}\ud.scrollup:hover {\ud opacity:0.99!important;\ud}\ud \uascript type="text/javascript">\ud x$(document).ready(function(){\ud x$(window).scroll(function(){\ud if (x$(this).scrollTop() > 100) {\ud x$('.scrollup').fadeIn();\ud } else {\ud x$('.scrollup').fadeOut();\ud }\ud });\ud x$('.scrollup').click(function(){\ud x$("html, body").animate({ scrollTop: 0 }, 600);\ud return false;\ud });\ud });\ud \ua!-- End Scroll Up -->