Solid State Guitar Amp Forum | DIY Guitar Amplifiers

alright I know it is just interferance but I was able to pick up my local AM channel 740 when I was breadboarding my LM386 project after adding a 741 chip to it. Is this normal? it is pretty cool though.

Anthony

On breadboards that usually are "in the open", have poor grounding and flimsy, non soldered, different metal contacts, I guess the unusual is *not* to get some interference.
Or you may live unconfortably close to said radio, in which case you will get it everywhere.
I live 1 block from the river coast in Buenos Aires, in the ancient (today only a tourist attraction) port of La Boca.
Some 10 years ago, i had that "zzzzzzzzt click click click zzzzzzzzt" sound *everywhere*, on any amp, radio, TV, Walkman, the works. (Even on the phone).
I almost got crazy, it appeared at random, lasting 10/15 minutes.
One day a sailor neighbor was visiting me and asked me "how are you picking that marine Radar?"
I went to the corner and saw this beautiful Spanish fishing ship being repaired.
It seems to be that radars have two (maybe more) settings: open sea (full power) and Port (a couple  watts or even milliwatts)
These guys were testing it full power.

Quote from: J M Fahey on December 13, 2009, 01:05:33 AM
On breadboards that usually are "in the open", have poor grounding and flimsy, non soldered, different metal contacts, I guess the unusual is *not* to get some interference.
Or you may live unconfortably close to said radio, in which case you will get it everywhere.
I live 1 block from the river coast in Buenos Aires, in the ancient (today only a tourist attraction) port of La Boca.
Some 10 years ago, i had that "zzzzzzzzt click click click zzzzzzzzt" sound *everywhere*, on any amp, radio, TV, Walkman, the works. (Even on the phone).
I almost got crazy, it appeared at random, lasting 10/15 minutes.
One day a sailor neighbor was visiting me and asked me "how are you picking that marine Radar?"
I went to the corner and saw this beautiful Spanish fishing ship being repaired.
It seems to be that radars have two (maybe more) settings: open sea (full power) and Port (a couple  watts or even milliwatts)
These guys were testing it full power.

Neat story.  I haven't dealt a whole lot with radio interference on than from trucker's CBs.  Here in Maine we don't have a lot of radio towers really.