Dark Shade Slayer
New Member
Hey all,
I have been browsing around for schematics etc for a circuit to pulse LED's to music, and have found only ones that involve a TIP31 transistor. Now I enjoy building things with what I have, and I don't have a TIP31... So I tried to find a suitable substitute for it. Because these are LED's, they draw very little current (around 20mA if I understand correctly (each of course)), so I thought for just one or two LED's maybe a 2n3904 would work. I made a circuit with it and it did not work... the LED's are on all the time, or don't come on at all depending on how I connect them, but they never flash. So I proceeded to try a 2n2222 (I assume that's what it is, it says MPS2222A and has a Motorola symbol on it...), it didn't work, I then tried what I believe is a 2SC2274 (it just says C2274 on it), and it didn't work... Seeing a pattern yet? Anyone have any ideas as to why this might not be working? I think my logic works out, but maybe someone else would say otherwise (which is fine)? If anyone wants to see the datasheets I can provide them, as for schematics Google has a bazillion of these things and they are almost all identical.
Thanks,
Dark Shade
I have been browsing around for schematics etc for a circuit to pulse LED's to music, and have found only ones that involve a TIP31 transistor. Now I enjoy building things with what I have, and I don't have a TIP31... So I tried to find a suitable substitute for it. Because these are LED's, they draw very little current (around 20mA if I understand correctly (each of course)), so I thought for just one or two LED's maybe a 2n3904 would work. I made a circuit with it and it did not work... the LED's are on all the time, or don't come on at all depending on how I connect them, but they never flash. So I proceeded to try a 2n2222 (I assume that's what it is, it says MPS2222A and has a Motorola symbol on it...), it didn't work, I then tried what I believe is a 2SC2274 (it just says C2274 on it), and it didn't work... Seeing a pattern yet? Anyone have any ideas as to why this might not be working? I think my logic works out, but maybe someone else would say otherwise (which is fine)? If anyone wants to see the datasheets I can provide them, as for schematics Google has a bazillion of these things and they are almost all identical.
Thanks,
Dark Shade