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The reason is that I have about 10 of each lying around and would like to do something with them. At first, I was thinking about constructing one of Rod Elliot's subwoofer amplifiers using the original transistors specified but thought that the danger and cost involved would be a bit too high for my liking.
I was wondering though, for future reference, would a V transformer be able to power the amplifier properly? This is a bit more like it and is ideal for a test amp for me. Thanks in advance. Find More Posts by jackand You would need a massive, probably air cooled heatsink to build a P68 of that power.
Rod's P3A is a revised design. Your Sanken's should work just fine in this circuit. The only thing is that the particular design of the P3A is layout-sensitive, so you might run into trouble making your own circuitboards for this amp. The SymAsym amp search this forum is also a good design that will work well.
Thanks alot jaycee. I'll have a look round and see what I can find. I might buy the boards for the Project 3A amp or I might try to design my own. Also, which version of the SymAsym amp should I use with those transistors. Thanks Jack. Find More Posts by east electronics. Funnily enough, sakis, that's where the transistors came from in the first place! I acquired the amp from my local church as it was not working and they no longer needed it.
If I remember rightly, it was a P with a fried driver circuit and input stages I think. Somehow though, it hadn't blown up the output transistors. Since I got it free, it was too costly to repair and I would have no use for it, so I scrapped it for parts. I saved the transformer and heatsink from there so I could use them if I was to clone the amp. Just wondering, do you have a schematic for the P amplifier because I wouldn't mind cloning it.
As I said though, I got the amp for free and didn't have the space to keep it so I thought I might as well strip it for parts. I saved pretty much everything from it, now it's all just waiting to be used. Besides, because I didn't bother buying the service manual where I could've sourced my own parts cheaper , yamaha were going to charge me a bomb for all of the different components needed to fix the amp 3 or 4 broken emitter resistors, a completely toasted driver and input stage and some burnt traces on the PCB that may or may not have worked.
I think I might just stick to jaycee's recommendations and just build a P3A or SymAsym with those transistors. I don't want anything complicated though because it will only be something put together for a bit of practice and to get some use out of my homemade UV box. I'd build the original SymAsym design. The others are quite complex and call for some fancy parts - particularly FETs that are not easy to get. You may need to reduce the 22pF feedback compensation cap to 3p3 or eliminate it altogether.
Last edited by jaycee; 4th May at PM. P3a will be also very happy with thuis type of semis BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is AM. Resources saved on this page: MySQL User Name. Stay logged in?
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