Flavio Vinicius Spalato Zanchi wrote:
Lee,
Many thanks for the reply. I'm absolutely sure that you and the community created the best design with what was available at the time.
Once again I am out of luck. TME, being in Poland, and thanks to Brexit, doesn't ship to the UK for the time being. So I will take the risk and order the SMD equivalents (MMUN2212LT1G , NSVMMUN2112LT1G),? with a bit of effort I think I can fit them on the board.
These pre-biased transistors are handy parts. They save parts, and thus save space on the PCB. They are bipolar, and so are not susceptible to static damage, and don't have parasitic "protection diodes" (which was useful for the RS-232 interface).
It's unfortunate that you're in the UK. I have the transistors; but postage for a 1-ounce letter to the UK is over $5, and the minimum package postage is over $15. They also insist that envelopes be "flat". I tried to mail an LED in an envelope, and it arrived with chips knocked out of it!
Lee Hart
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
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Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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Lee Hart