If not the impossible, I am likely asking for the implausible, or at least the uncommon.
I need an amplifier that will take a microphone input and drive a modest loudspeaker.
Preferred microphone is the Panasonic WM-61A:
http://parts.digikey.com/1/parts/853-microphone-cartridge-6mm-omni-wm-61a.html
I would like about 5W into an 8 Ohm load for the output, but will consider anything with at least 100mW.
A separate preamp and power amp stage is a possibility. A single chip amp would be perfect (if I could get that much gain in one stage). Even a driver chip with external MOSFETs may be OK.
It needs to be SUPER low cost, because I will need to build a ton of them (on NO budget).
Shared parts, especially shared power supply may simplify and reduce cost. (for example a chip amp with 4 channels of amplification on a single chip)
Mic level IN, speaker level OUT. 24-48 channels of this. (the signals all need to be discreet/isolated though)
What would one even call an amplifier that went from Mic level to speaker level? (other than "two amplifiers")
30-something years ago, I built these from a single transistor (called a GE-3 back then) and maybe only 3 other non-semiconductor components (for each channel) and ran them off of a car battery.
Really looking for cheap and simple. Limited bandwidth is OK. Inefficient is OK. 2% THD is OK (but seriously against my religion - ouch!).
Any ideas on where I can start looking?
I need an amplifier that will take a microphone input and drive a modest loudspeaker.
Preferred microphone is the Panasonic WM-61A:
http://parts.digikey.com/1/parts/853-microphone-cartridge-6mm-omni-wm-61a.html
I would like about 5W into an 8 Ohm load for the output, but will consider anything with at least 100mW.
A separate preamp and power amp stage is a possibility. A single chip amp would be perfect (if I could get that much gain in one stage). Even a driver chip with external MOSFETs may be OK.
It needs to be SUPER low cost, because I will need to build a ton of them (on NO budget).
Shared parts, especially shared power supply may simplify and reduce cost. (for example a chip amp with 4 channels of amplification on a single chip)
Mic level IN, speaker level OUT. 24-48 channels of this. (the signals all need to be discreet/isolated though)
What would one even call an amplifier that went from Mic level to speaker level? (other than "two amplifiers")
30-something years ago, I built these from a single transistor (called a GE-3 back then) and maybe only 3 other non-semiconductor components (for each channel) and ran them off of a car battery.
Really looking for cheap and simple. Limited bandwidth is OK. Inefficient is OK. 2% THD is OK (but seriously against my religion - ouch!).
Any ideas on where I can start looking?
Thanks! That looks good - and cheap - and simple (low component count) solution.star882 said:
Is there something special about this amp that makes it particularly suited to using and very low level input (microphone level, as opposed to line level) ?
Do you happen to know if there is anything similar that would have a bit more output power?
(by cheap, I certainly don't mean that we have to stay under $1 per channel necessarily...)
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