On 5/5/14 2:14 AM, Jan Rychter wrote:
On 4 maj 2014, at 18:10, [email protected] wrote:
Firstly, I only do direct-drive.
I dont use driver chips. Instead, I use either NPN or NMOS discrete devices,
because I can ensure constant-current thru the cathode.
Which transistors do you use? I'm especially interested in tiny SMD ones.
Dropping some hints would be very helpful -- it is difficult to just start
searching for semiconductors out there.
--J.
I use the Toshiba TD62083AFN for my Nixie watch. Eight 50-volt
Darlington transistors per TSSOP package. You have to make a 50V
commutator diode tap on your PS, but it works well.
For individual transistors, the SOT-23 MMBTA92 is commonly used, but
placing 30 of those on a board is not my idea of fun, even with pick and
place.
--
David Forbes, Tucson AZ
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