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There is also MPQ3906 which is 4 times 2n3906 (4 matched PNP). It is a
litle bit expensive but good transistor.<br>
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Metrophage wrote:<br>
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<pre wrap="">--- <a class="moz-txt-link-abbreviated" href="mailto:larry@unicode.com">larry@unicode.com</a> wrote:
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<pre wrap="">I have been looking for LM394's for use in the CGS VCO module and
found a couple of sources at just over $5US each. I noted from
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<pre wrap=""><!---->several
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<pre wrap="">articles that the MAT02 might be usable as an alternative, however
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<pre wrap=""><!---->I've only
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<pre wrap="">found a few at $15US each! Is there any significant difference
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<pre wrap=""><!---->between these
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<pre wrap="">two parts? At there any substitutes that would work just as well but
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<pre wrap=""><!---->be
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<pre wrap="">more available and cost less? Should I jump on either of the parts
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<pre wrap=""><!---->at the
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<pre wrap="">indicated prices?
Larry T.
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Well, I never see LM394's anywhere. I have tried MAT02's with excellent
results on my ASM-1 VCO clone as well as on my (unfinished) real ASM-1.
Word on the street is that the MAT0x and THAT units are the best
matched. I am not very knowledgable about transistors yet, bet these do
seem a lot better than, for instance, the 3046 arrays.
I don't know if you need these to be a certain pin format for a PCB, or
if you are wiring it yourself - but there are some decent, inexpensive
transistor pairs out there.
2SC1583 - dual NPN, 5-pin SIP, common emitter, Mitsubishi
2SA798 - dual PNP, 5-pin SIP, common emitter, Mitsubishi
2SA1349 - dual PNP, 7-pin SIP, Toshiba
2SC2291 - dual NPN, common base
2SC3381 - dual NPN, 7-pin SIP, Toshiba
These can often be found in price ranges from less than a dollar, to
two dollars each. I know I have seen them on the pages of MAT
Electronics (PA), and electronix.com (OH). Maybe not as accurate and
low-noise as the $15 units, but probably still consderably better than
the RCA arrays or hand matched (same substrate). If you are interested,
there are datasheets online. For years I had no idea that these
existed!
$5 for LM394 is probably quite good. Some places still carry the Analog
Devices SSM2210 matched NPN pair for a comparable price.
CJ
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