MM209 Audio Amplifier module


#1

My purchase amplifies from a small transistor radio receiver circuit, but not well enough into a small loudspeaker.
The data states a default gain of 18 dB - and an instruction “cut” to, presumably, increase the gain.
There are 2 positions, to connect Resistors up to 200 k Ohms, and an instruction to “cut” the circuit.
Could someone please explain where to “cut”, and recommend typical resistors, please?


#2

You don’t increase the gain by adding the resistor. You’ll lower it.


#3

Thankyou - then 18 dB (which I thought was quite high anyway) is the best one can expect from this module? Thankyou.


#4

Yes exactly!
So if you want the lower the gain. you’ll need to add a resistor or potentiometer if you want to make it adjustable.
Cut between the pads as shown in the picture and mount the resistor or the potentiometer
image

Best Regards,
VEL337


#5

Thankyou very much - for the present I will try my circuit(s) with the 18 dB gain.