Hi everyone,
Would someone please determine the components values for this simple amplifier?
I need to run it with a 24V battery and also the sound quality isn't important at all!
Thank you in advance
Stinger.
Would someone please determine the components values for this simple amplifier?
An externally hosted image should be here but it was not working when we last tested it.
I need to run it with a 24V battery and also the sound quality isn't important at all!
Thank you in advance
Stinger.
Well, thanks again for the fast replies.
The load is a 2...4 ohms speaker (2W). What should be the transistors?
The load is a 2...4 ohms speaker (2W). What should be the transistors?
How do you calculate the gain? It looks to me as 2 common-emitter circuits connected with the output going back into the first stage to act as negative feedback, which in my simulations leads to more linear amplification than if there were no feedback, right? But I'm trying to do node analysis to find the gain as a function of R3, R4, R5 and not succeeding. 🙂
Circuit Wiring Diagrams says the gain is 1+(R4/R5) = (R4 + R5)/R5
Radio-Electronics.com says (R4 + R5)/R4.
So I'm confused, but 1+R4/R5 matches my simulations.
And if it doesn't depend on R3, then how do you set R3?
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You have searched for and found a bad circuit.
It won't drive a 2ohm speaker, properly
2W into 4r0 requires a maximum output of 4Vac and that could be obtained using a supply of 12Vdc, not 24Vdc.
It could be developed into a stage to drive line level signals into a 2k load.
It won't drive a 2ohm speaker, properly
2W into 4r0 requires a maximum output of 4Vac and that could be obtained using a supply of 12Vdc, not 24Vdc.
It could be developed into a stage to drive line level signals into a 2k load.
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Maybe this would be better, and waste less battery power as well. See fig.2 for a single supply circuit.
http://www.ti.com/lit/ds/symlink/lm1875.pdf
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