Good day, I'm planning to build a mini amp of around 2watts or greater in 8 ohms for my MP3 just for nite listening with small speakers(5w,8r) which I have 8 pcs of it. It so happened that i have 4 pcs of LA6500 and 4 pcs 6510 on the box and as per attached datasheets they can be used in audio. Has anybody used this power amps in audio amps?
I can't find any schematics for them, can they be used in bridge or parallel mode? and last thing is can somebody here show me schematics to do use them....+/- 15v reg Rails........thanks and hoping for your kind considerations.
I can't find any schematics for them, can they be used in bridge or parallel mode? and last thing is can somebody here show me schematics to do use them....+/- 15v reg Rails........thanks and hoping for your kind considerations.
I'd say they can be used as an audio amp. They have very limited output current (1 amp max), so don't use +/- 15 volt rails. Use +/- 8 volt rails with no less than 8 Ohm loads and you can get up to 3 watts of clean (pre clipping) power. A 2 amp 6-0-6 volt transformer (12 volt center tapped) would put you in the neighborhood for a power supply.
Thanks John for your kind opinion...yes they are limited to 1A output current but what I'm planning is if these can be paralled to get at least 2A with the same +/- 15v and 8 Ohms load.
Also ,What if I do like to put current booster trannies at the output like the attached schematics, will it provide more distortion?
Also ,What if I do like to put current booster trannies at the output like the attached schematics, will it provide more distortion?
Attachments
How much output power are you looking for? You stated 2 watts or greater for some 5 watt, 8 ohm speakers, so 2 to 5 watts, I'm thinking. The one IC as stated would work.
You could parallel them with current sharing resistors. You would then have a 10~12 watt amplifier. It would be much easier just to buy a couple LM1875 or TDA2050 ICs and build the amp since less than half the parts are needed than a parallel arrangement.
I can't say how well the circuit with output driver transistors would work for audio, but again if you want 15 volt rails, go with the above mentioned chips.
You could parallel them with current sharing resistors. You would then have a 10~12 watt amplifier. It would be much easier just to buy a couple LM1875 or TDA2050 ICs and build the amp since less than half the parts are needed than a parallel arrangement.
I can't say how well the circuit with output driver transistors would work for audio, but again if you want 15 volt rails, go with the above mentioned chips.
One comment - kind of slow op amps - slew rate of .15 uV/sec - probably high distortion for high frequencies and may add problems if used as a driver. Looks like good for low powered projects and experiments, but not worth putting with expensive parts or extensive modification. Just my 2 cents.
^ agreed, these will sound terrible and along with the idea for more output power, it's much, MUCH better to pick a different chipamp chip.
I know they are not suitable for hi fi, but Datsheets says it is for hi quality audio amplifiers, Maybe in low power application they might work. I just want to put them in use for my PC speaker rather than staying in my box and buying a new chips.
Johnr66, yes 2 watts is enough for me and a single chip will do the job and by just providing adequate heatsink.
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