Howdy all..... 
Am thinking about building a portable DC powered (12V car battery for now) guitar/vocal mixer/power amplifier in the 20W - 30W output range.
After scanning some of the past messages here, it would appear that a chip amp solution would be appropriate.
Any suggestions for building such a beastie, references to past threads covering this topic etc would be much appreciated.....thanks!
PS......I notice that the term "gainclone" is used quite frequently. Is this just a generic term for DIY amplifiers or does it refer to a specific line of chip amps?
Thanks again......
Am thinking about building a portable DC powered (12V car battery for now) guitar/vocal mixer/power amplifier in the 20W - 30W output range.
After scanning some of the past messages here, it would appear that a chip amp solution would be appropriate.
Any suggestions for building such a beastie, references to past threads covering this topic etc would be much appreciated.....thanks!
PS......I notice that the term "gainclone" is used quite frequently. Is this just a generic term for DIY amplifiers or does it refer to a specific line of chip amps?
Thanks again......
Portable PA Power...
Hello Lawrence,
If you want best quality and your desired output power go for DC operation using two 12V batteries connected so as to provide +12V and - 12V. (Gel-Cell batteries are ideal)
+/- 12V is perfect for pre-amp supplies, and there are TDA series power op-amp ICs available that run bridging speaker output connection.
You may need to run two IC amplifiers and two speakers to achieve clean 20-30 W - double this for more.
Tda Selection Guide
Eric.
Hello Lawrence,
If you want best quality and your desired output power go for DC operation using two 12V batteries connected so as to provide +12V and - 12V. (Gel-Cell batteries are ideal)
+/- 12V is perfect for pre-amp supplies, and there are TDA series power op-amp ICs available that run bridging speaker output connection.
You may need to run two IC amplifiers and two speakers to achieve clean 20-30 W - double this for more.
Tda Selection Guide
Eric.
There are some TDA power op-amps that were designed for car-audio and only need one battery (12V and ground).
Some of them are powerful (Philips has one that gives you 70w), but they will consume some current, you'll need a big battery.
If you go for these ones and one battery, and you need signal op-amps on the preamp seccion, you can make a virtual ground with two resistors for them, but you'll have to choose op-amps that work well with low voltages.
Some of them are powerful (Philips has one that gives you 70w), but they will consume some current, you'll need a big battery.
If you go for these ones and one battery, and you need signal op-amps on the preamp seccion, you can make a virtual ground with two resistors for them, but you'll have to choose op-amps that work well with low voltages.
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