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FYI, I think there are about 3 versions of the RS MiniAmp. The current version is 277-008C. I think there is also a version A and B. Attached is another version that claims to be official. The circuit P001-V2, is one that I drew out after I disected an mini-amp, and traced out the circuit and...
The RS amp has worked well the last 25 years but it is subject to interference from cell phones, or 60hz power lines, or sometimes you will pick up distant radio swig all in the background.
So a better replacement for the RS mini-van for this application would likely be the RS circuit with maybe some filtering for the low input frequency.
I've heard that the LM386 is an outdated component. Is there a more modern replacement?
What makes this circuit unable to drive headphones? Can this circuit be modified to use headphones?
With the Radio Shack amp, we could use either headphones or the line in to the truck Aux input. The Aux input are made to take the headphone output of MP3 players.
So that I understand this circuit:
1. The 330nF and the 220k resistor set the frequency range from 0 to 25Hz.
2. The 9V, two 100K resistors, an 220k resistor going into the (+) inputs provides a DC offset for the output signal?
3. The 200k resistor and the 4.7k resistor sets the gain of each...
I have a few versions of the radio shack schematic. Can you send me a link to the 'correct' one?
The pre-amp that you suggested, how could it be used to drive headphones, if needed?
The amplifier is to generate an audio signal from a geophone (geospace 20DX specs attached).
Geophone to the mini-amp, to either headphones or aux input of truck stereo. So ground movement becomes audible.
My business uses the Radio Shack mono Mini-Amplifier, part 277-1008. This item is an integral part for a certain sensor that we use. Since Radio Shack may not be around forever, I need to find a replacement for this unit.
I'm considering making my own. Does anyone know of a similar circuit...
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