electrichild
Active member
Hello,
I have this problem building an Amek M2500 Eq
http://www.gyraf.dk/schematics/amek_m2500_eq.gif
all seems OK but setting the HF or others frequency, gain and Q pots to max the entire section goes into oscillation: it' s audible at low listening levels and sounds like continuous clicks or pops. Setting the gain to normal levels after few minutes disappears again.
When there is no oscillation anyway the sounds have a little and audible distortion compared to bypassed sound.
Just tried to view in an frequency analyzer (I haven't a scope) and found some pulses 50-60Hz at -70dB.
I leave the circuit unbalanced.
Any suggestions?
Thanx
I have this problem building an Amek M2500 Eq
http://www.gyraf.dk/schematics/amek_m2500_eq.gif
all seems OK but setting the HF or others frequency, gain and Q pots to max the entire section goes into oscillation: it' s audible at low listening levels and sounds like continuous clicks or pops. Setting the gain to normal levels after few minutes disappears again.
When there is no oscillation anyway the sounds have a little and audible distortion compared to bypassed sound.
Just tried to view in an frequency analyzer (I haven't a scope) and found some pulses 50-60Hz at -70dB.
I leave the circuit unbalanced.
Any suggestions?
Thanx