I need some help here folks. Being from Alabama, I am having a little problem with the instruction manual that accompanied this amp. What I want is to be able to take an old Storm speaker box that I have and put this amp in it and use it on my way to stardom. I want to be able to take a 120v. A/C to D/C 12volt laptop power supply. (Which I have) I read it will run on 9-25 Volts D/C to run the amp, or hook it to truck battery when no 120 A/C available. I can figure out it will run 4-8 ohm speakers stereo @34 watts a channel. I have drilled and tapped threads in a heatsink and mounted it. Now I need somebody to tell me where to attach the wires so it will run one channel (mono) and where power +/- needs to go. Also where to attach +/- speaker wires. Got a couple of red LED 120mm fans to make this baby from frying. Anybody that can help me through this little language barrier, I would appreciate.
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This chip is in a kit I bought - Mono amp powered by 12V, supposed to have an 18 watt output.
Does anyone need me to scan all the paperwork?
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BTW, this amp from China cost me around 3 bucks. I can hook you up if you want. Just ask.
Keep in mind I'm a pure amateur to this but here ya go
Power - use the blue colored terminal block squared in red in the pic that is labeled for DC
Input - The RCA jacks squared in blue - you'll either have to make an adapter from some RCA cables or remove the RCA jacks and solder whatever jack to the connections at the board. You may have to double up your connections as that could be a right and left type input.Not sure
Output - the blue colored terminal blocks squared in green.
This is where I'm unsure of results as any of them I have looked at schematics for there is usually a slight difference in components between stereo and bridged (mono). You may be able to make it act like a bridged/mono amp by jumpering a neg of one channel's output terminal block to the the pos of the other channel's terminal block. Then use the remaining neg and pos spots for your neg and pos speaker wires respectively.
It isn't actually possible to jumper any of the speaker output connections together. This is a stereo Bridge Tied Load amplifier, in which each speaker is connected across a pair of outputs. That's why it uses four TDA2030As, as each chip drives one side of each speaker. All the output terminals have to be kept separate for this to work. On the other hand it's OK to connect the two RCA (left and right) inputs together so they're fed with the same signal, it's only the outputs that have to be kept apart.
In fact you could look at this amp as two pairs of bridged mono amps, where each speaker is connected across one pair. Just thinking aloud...
That's where my amateur knowledge came into play as I don't know if you can continue to daisychain the opamp chips to gain any beneficial output.
Does that make any sense as to explain my thinking?
The thing is, the power available to push into a given speaker depends on the maximum voltage available to drive it . Suppose you have a +12V supply. One TDA2030A on its own will swing its output between roughly +2V and +10V (Don't know the exact figures but something like that). That's an ac voltage of 8V peak-to-peak. This would be connected through a large capacitor to the speaker, which would see a voltage that swung between +4V and -4V peak with respect to 0V. The Bridged Mono/BTL arrangement using two amplifier chips doubles the voltage across the speaker because when one terminal is at +10V the other is at +2V, and vice versa. Therefore the speaker gets +/- 8V across it, and four times as much power in it, but that's the best you can do, because no more voltage is available.
Makes sense, thanks for the explanation.
http://www.petervis.com/Electronics_Kits/TDA2030A_Audio_Amplifier_A...
http://atoomnet.net/tda2030a-amplifier-diy-kit-schematic-and-solder...
Several configurations here:
http://www.electroschematics.com/tag/tda2030-circuits/
This one may be closest to what you are doing:
http://www.eeweb.com/blog/extreme_circuits/18w-18w-stereo-hi-fi-aud...
Ron, I think you may have me in the ball park. I did a site search for a TDA2030A with 4 of them on the board. I have a 2 channel with 34 watts per channel. I know that is what the 2 RCA jacks are. I say ,I know, I really mean that is what normally done with a red and a white RCA jack. Red is right channel and white is left channel This site is the closest to anything I have seen do far, I will look closer tomorrow. Got Dr. appointment for a EKG in AM so that will pretty well waste most of tomorrow.Trying to read schematics on a cell phone in the waiting room would give me the DT's and run my blood pressure out of sight so I will look in PM.
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