I acquired a Yamaha yg15 amp. The power transformer is toast. I'm looking for a schematic for it. I've been all over the internet without any luck. What I'm mainly looking for is the output voltage on the rectifier circuit. Thinking about battery operated.
Tags:
If the power transformer is bad, it will cost more to fix it than to buy another.
I had a Behringer 10watt guitar amp that did the same thing. I removed all the old electronics(leaving the speaker and metal chassis) and made a 1watt 9volt Ruby amp and installed it. Works great and is the perfect little practice amp. It actually sounds better than the amp I replaced.
You could buy one of those 2.5watt amps and a Psycho Kob from Gitty and wire them up using that cabinet and speaker. I use a walwart instead of battery.
You may also find a similar small amp at a local pawn shop for little money.
I'm mainly looking for the rectified voltage. Yamaha can't or won't help. I have a couple salvaged transformers that possibly could work. Not a big deal!
photo of the dead transformer? are there any markings on it? are you sure it is the transformer and not the diode bridge in the rectifier?
No photos or markings(first thing I looked for, only qc sticker). I gutted the transformer to make a pick up. The transformer's primary side was fried. The rectifier bridge is fine(tested with ohm meter). In hindsight I'm thinking I should have rewound the transformer pita but doable. I may hook a 9v a.c. wall adapter up and see what happens, at this point nothing to loose. Really would like to use a 12 v gel battery for portability.
Get the model number off the main chip and google it for specs. That way you find out the operating voltage, it could be 9volts, 12volts or 18volts DC.
Its a tda2030a, from what I've read 6- 36 volts. So I think I'll split the difference and go with 12 volts and keep it on the safe side. What's your thoughts?
TDA2030A data sheet here https://www.st.com/resource/en/datasheet/cd00000129.pdf
says 18W output into 4 ohm load with +- 16V . were there 2 windings on the secondary? it looks like it can be hooked up to a single supply but the chart of output power to supply voltage suggests yoy will need around 30V DC to get 15W into a 4 ohm load. or around 36 V if it is an 8 ohm load.. chart starts at 24V with 10W into a 4 ohm load. so you could series 2 gel cells for 24 volt it would work but not push the amp
I could do 3 gel cells for 36 v, I don't plan on cranking up the amp and grinding away!
good ideas
When my amp went out, it also fried some output caps along with the overheated chip. So have a good look at all the components and check them with a voltmeter if you have one.
Damn good idea about the specs for the chip, didn't even think about that. Thanks all other components check out. If it had been the secondary side I would probably scraped the unit.
Started by J. D. Woods in Performances, How to Play, Lessons, Concerts. Last reply by BrianQ. 9 hours ago. 4 Replies 0 Likes
Started by Southern Ray in Other stuff - off topic, fun stuff, whatever. Last reply by A.D.EKER yesterday. 4 Replies 0 Likes
Started by Rich Butters in Building Secrets, Tips, Advice, Discussion. Last reply by Crazed Fandango on Tuesday. 4 Replies 0 Likes
Started by J. D. Woods in Performances, How to Play, Lessons, Concerts. Last reply by J. D. Woods on Saturday. 7 Replies 1 Like
Started by Nomad Jack in Performances, How to Play, Lessons, Concerts. Last reply by J. D. Woods Apr 17. 7 Replies 2 Likes
Started by Moritz Voegeli in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Apr 14. 6 Replies 2 Likes
Started by Timothy Hunter in Other stuff - off topic, fun stuff, whatever. Last reply by Timothy Hunter Apr 10. 14 Replies 3 Likes
Started by Tom T in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Apr 9. 9 Replies 0 Likes
Started by Southern Ray in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Apr 4. 7 Replies 1 Like
Started by Timothy Hunter in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Mar 27. 1 Reply 2 Likes
Started by Taffy Evans in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Mar 10. 1 Reply 3 Likes
Started by Cigar Box Nation in Feature Articles. Last reply by BrianQ. Mar 9. 4 Replies 3 Likes
Started by Ghostbuttons in Building Secrets, Tips, Advice, Discussion. Last reply by Timothy Hunter Mar 9. 5 Replies 1 Like
Started by Justin Stanchfield in Building Secrets, Tips, Advice, Discussion. Last reply by Taffy Evans Mar 8. 6 Replies 0 Likes
Started by Ken I in Building Secrets, Tips, Advice, Discussion. Last reply by Brian partington Mar 8. 8 Replies 0 Likes
Started by Southern Ray in Cool gear discussion - that's not cigar box related. Last reply by Southern Ray Mar 6. 5 Replies 0 Likes
Started by Taffy Evans in Other stuff - off topic, fun stuff, whatever. Last reply by Taffy Evans Mar 5. 4 Replies 2 Likes
Started by Justin Stanchfield in Building Secrets, Tips, Advice, Discussion. Last reply by Carl Floyd Mar 1. 15 Replies 0 Likes
Started by Joe in Performances, How to Play, Lessons, Concerts. Last reply by Carl Floyd Feb 29. 13 Replies 0 Likes
Started by Chance in Building Secrets, Tips, Advice, Discussion. Last reply by Southern Ray Feb 22. 12 Replies 1 Like
Posted by Vlad on March 31, 2024 at 11:48pm 0 Comments 1 Like
Posted by Vlad on March 6, 2024 at 2:32am 5 Comments 2 Likes
Posted by billy jones bluez on February 28, 2024 at 2:09pm 0 Comments 0 Likes
Posted by billy jones bluez on February 17, 2024 at 11:00pm 0 Comments 0 Likes
Posted by Vlad on February 11, 2024 at 1:06am 1 Comment 1 Like
May 11, 2024 from 11am to 8pm – Speakeasy Grill
0 Comments 0 LikesMay 30, 2024 from 6:30pm to 10pm – The Casual Pint of Huntsville
0 Comments 0 Likes© 2024 Created by Ben "C. B. Gitty" Baker. Powered by
Cigar Box Nation is presented by C. B. Gitty Crafter Supply, your one-stop-shop for Cigar Box Guitar parts and accessories!