A while back I posted on the comments about this nasty little op amp that I built. It has 2 IM386N1 chips and it's a 2 stage amp. It was inspired by the Ruby amp.

Here's a schematic if anyone is interested in building one.

Views: 880

Replies to This Discussion

They will work, but will start to rag out soon. Go to your local thrift store and get a surround sound subwoofer. They usually have a couple for cheap.

A resistor can be added to the 8ohm across the terminals, but I don't know the needed value. 4ohm sounds logical, but not sure if it's correct.

A amps watt rating can be confusing at times because there's a operational wattage for the amp and a output wattage for the amp. Sometimes an amps label will show the operational wattage and people will think it's the output wattage by mistake. Example: My Silvertone 1482 tube amp says on the back label that it's a 117Volt 70Watt amp, but the output wattage is 15Watts.

Here is the page from WGS on the speaker I'm going to use and the measurements are all listed at the bottom of the page. This speaker will handle over 93 decibels. Should be enough.https://wgs4.com/vet10

These speakers rock. I like their British Voiced Green Berets too.

Oh man.... you are the best....this is just what I have been looking for. I've been scouring the net for a schematic that had the pots included in the diagram. Thanks a million for posting this drawing.

I revised the schematic and posted it at the top of the page.
Changes are N3 chips instead of the N1's due to the N1 chip's not lasting long in a bridged amp.
A change in pot/controls: 1 volume - 1 tone - 2 gain.
Added caps in the output lines: the cap values will change depending on the speakers used.

Thanks for the updated schematic Paul. What do you mean by cap changes due to the speaker?

For example: The Ruby and other single chip amps have a 220uf cap in the + output line to the speaker. Since this is a bridged amp, it gets a cap in the + and - lines to the speaker.

I used a WGS 8ohm 20watt 10" speaker for my build and I started off with the 220uf caps, but it was very very bright sounding. Might be what you like, just not what I was going for. So I tried a couple of different value caps til I got the tone I liked which ended up being 10uf for both lines. So the speaker you use(due to it's voicing) or your personal likes will determine which output caps will be best.

My original build had no caps in the output lines, but also had a lot of unwanted noise and some oscillation.

I did not know the about adjusting tone with the caps. Thanks for the info
Hey Paul. Thanks again for posting these schematics. I whipped up the revised one and I have an issue maybe you can help with. I have sound coming through my speaker. The tone control works the switch for the cap values works and the 2nd gain circuit works. My ssue is with the first gain circuit. I am getting sound for it but also a lot of squelch. I know somethings wrong here. I've triple checked the wiring and I just can't seem to see what's wrong. I've switched out both chips 2 times and it still does it. Any insight into where I went wrong? Tips for trouble shooting?

Can you post a pic?

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 BasicsCigar Box Guitar Parts Store

Site Sponsor

Recommended Links & Resources


Discussion Forum

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 28, 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 16, 2020. 11 Replies

Ruby Amp

Started by BrianQ.. Last reply by Southern Ray May 17, 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 3, 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 27, 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 16, 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

Combo Amp Build

Started by Paul Craig. Last reply by Paul Craig May 27, 2016. 113 Replies

Blog Posts

How to add photos?

Posted by Stephen Sell on January 13, 2022 at 1:19pm 2 Comments

My first 3 string cigar box guitar

Posted by Stephen Sell on January 13, 2022 at 1:16pm 1 Comment

Shedding a Tear for Dave Lynas

Posted by Poorness Studios on December 20, 2021 at 8:30pm 4 Comments

Latest Activity

ILL GREEN replied to ILL GREEN's discussion Truss Rods. Needed?
9 minutes ago
BrianQ. left a comment for Philly Dupree
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for Wayne
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for John Daley
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for Mike
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for Timothy Kenefick
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for Mark Coulter
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for StuartDavidson
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
BrianQ. left a comment for Jim Tomsovic
"Welcome, check out the Resources tab for build/play info and join some groups located in the Posts…"
1 hour ago
Jim Tomsovic posted a photo

CBG # 1

Needs hardware for finish.
2 hours ago
tony cousins liked Ken Vickerson's photo
3 hours ago
Profile IconJim Tomsovic, Ian Knott, StuartDavidson and 6 more joined Cigar Box Nation
4 hours ago

Events

Music

© 2022   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 -->