Question 1:
I built the circuit on the LM386 datasheet with the amp at a gain = 20. Everything works fine.
I then adjusted the gain to 50 and it works correctly.
When I adjust the gain to 200 the speaker just squeals horribly.
I have built this circuit before and used a gain of 200 with no problems. Any idea of what I could be doing wrong?
LM386 datasheet: http://cache.national.com/ds/LM/LM386.pdf
Queation 2:
I hooked up a preamp circuit using a LM741 and send the output to the amp I built with the LM386. Needless to say the output to the speaker is very bad quality.
Is there anything special I need to do with the output of the preamp before it goes to the input of the audio amp?
I have attached the LM741 preamp schematic
Thanks all
-newb
I built the circuit on the LM386 datasheet with the amp at a gain = 20. Everything works fine.
I then adjusted the gain to 50 and it works correctly.
When I adjust the gain to 200 the speaker just squeals horribly.
I have built this circuit before and used a gain of 200 with no problems. Any idea of what I could be doing wrong?
LM386 datasheet: http://cache.national.com/ds/LM/LM386.pdf
Queation 2:
I hooked up a preamp circuit using a LM741 and send the output to the amp I built with the LM386. Needless to say the output to the speaker is very bad quality.
Is there anything special I need to do with the output of the preamp before it goes to the input of the audio amp?
I have attached the LM741 preamp schematic
Thanks all
-newb