Hi, this is my first post on these forums, and im already asking for help..
A few weeks ago, i built my first amp, a simple cmoy, that didnt work at all because of blown caps..Instead of changing the caps, i made another board, again with used caps - it worked, quite well on low levels, but once i turned the pot, with the volume increase increased the ammount of hiss..Talked to a teacher, he said i should use multithread wire and increase the resistance on the negative feedback loop..
Another issue is the lack of bass at any level.When at full volume, everything i can hear is the mid frequencies, everything else being(or being covered by) hiss.
I made a third a few days ago, thinking it was the caps, this time using smaller, still old though, caps, with everything else new.The hiss was identical to the old one.
Here are some more details on the build - its the standard cmoy schematic from tangentsoft.
RLED - 10k; currently no Rled/led connected on it.
R1 - 4.7k
R2 - 100k
R3 - 2.2k
R4 - 10k
R5 - hiss is the same with a bridge and 47 ohm resistor..
C1 - 220u
C2 - 100n(0.1u); old, couldnt find new anywhere.
10k pot, multithread wire everywhere, 9v battery.
IC is TL072/LM2904.
I havent tried that feedback loop thing, i wanted to know all possible problems before gutting this one or making a fourth..
A few weeks ago, i built my first amp, a simple cmoy, that didnt work at all because of blown caps..Instead of changing the caps, i made another board, again with used caps - it worked, quite well on low levels, but once i turned the pot, with the volume increase increased the ammount of hiss..Talked to a teacher, he said i should use multithread wire and increase the resistance on the negative feedback loop..
Another issue is the lack of bass at any level.When at full volume, everything i can hear is the mid frequencies, everything else being(or being covered by) hiss.
I made a third a few days ago, thinking it was the caps, this time using smaller, still old though, caps, with everything else new.The hiss was identical to the old one.
Here are some more details on the build - its the standard cmoy schematic from tangentsoft.
RLED - 10k; currently no Rled/led connected on it.
R1 - 4.7k
R2 - 100k
R3 - 2.2k
R4 - 10k
R5 - hiss is the same with a bridge and 47 ohm resistor..
C1 - 220u
C2 - 100n(0.1u); old, couldnt find new anywhere.
10k pot, multithread wire everywhere, 9v battery.
IC is TL072/LM2904.
I havent tried that feedback loop thing, i wanted to know all possible problems before gutting this one or making a fourth..
