05-05-2015, 11:31 AM
Any NPN transistor with a Icmax of >100mA should do. e.g BFY51 or BC337. You don't need the 100k pull up or the 0.1uF on the base. Also change the 1k series resistor on the base to 10k.
For a variable time change the 22k for a 10k in series with a 22k pot would give you a time between 2.5s and 7.5s approximately.
If you want a couple of BC337s let me know and I'll bring them to NVCF. I'll be wearing my avatar badge of our dog who looks the same now as when the picture was taken in 2006.
Keith
For a variable time change the 22k for a 10k in series with a 22k pot would give you a time between 2.5s and 7.5s approximately.
If you want a couple of BC337s let me know and I'll bring them to NVCF. I'll be wearing my avatar badge of our dog who looks the same now as when the picture was taken in 2006.
Keith
