I've looked back through my posts but can't find who sent me link to buy this amp board, so I have it , came w/o any instructions and two of the connections are only marked in Chinese. Any help on how to use this as a CBG amp would be appreciated!
here is where it came from> http://www.ebay.com/itm/131832286247?_trksid=p2057872.m2749.l2649&a...
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Yeah i think i am going to go this route as well. I like the idea of having it as a separate preamp or even building it into my amp enclosure then putting it on the CBG itself. I just dont think i would like the look of it my CBG.
are you going to use this as a 2 channel amp with 2 inputs? or are you going to bridge the inputs?
2 x 35 watts is going to be loud! i built myself a 100W amp back in the 80's and used 2 x 12"speakers scavenged from broken guitar amps. the thing was so loud i dont think it was ever used past 5.....lol
its not quite as easy as that. you cant bridge a class D amp speaker output. besides you will get a little more power if you are feeding the altered signal to both channels than if you tried to bridge the speaker output. factor in the added cost of a higher wattage speaker needed to handle the bridged output.
plus you will need another board before the power amp. you need to invert the signal to say the left channel and feed the normal signal to the right channel this will drive the left channel full negative swing and the right channel full positive swing effective giving you twice the voltage swing across the speaker.
actually i just checked the TDA7377 amp chip on that board and its an interesting chip.. it can be set for 4 in 4 out. and in the configuration of this amp it is 2 in 2 out and the outs are already bridged internally.... so you definitely cant bridge the two outputs....
check out this preamp board. This might be interesting as a tube preamp.
https://www.amazon.com/Qianson-Pre-amp-Amplifier-Headphone-Circuit/...
requires a 12 AC power supply to work. that might present some problems....
wrong way to look at it. you can get wall warts that output AC. you could try to find one with 12V AC output feed that to the preamp and also feed that into a 4 diode rectifier then add a few Caps to filter it then feed the resulting ~ 16 V DC to the amp if it can take it or a voltage regulator down to 12 V DC if needed....
That is a good idea. For this build want to keep it as simple as possible and was hoping to use the power supply i already have since I am still very new to all of this. If this one is successful i am going to attempt to use the tube preamp on my next one since I think that will give me more of the sound i am going for. When start that build I may have questions for you. Thanks
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