22 Mar
2005
22 Mar
'05
4:35 p.m.
Hi folks,
I am currently modifying my Teletype ASR33 into a LT33 according to the DEC
specifications to work with my PDP-8/L. Does someone know what is a
Thyractor (GE 6RS20SP4B4) ? Some kind of voltage clamping device ?.
How could I make one, using, for instance a pair of thyristors or a pair of
zenner diodes ?
Many thanks,.
Philippe Sonnet
23 Mar
23 Mar
12:04 p.m.
Hi,
I am currently modifying my Teletype ASR33 into a LT33
according to the
DEC specifications to work with my PDP-8/L. Does someone know what is a
Thyractor (GE 6RS20SP4B4) ? Some kind of voltage clamping device ?.
How could I make one, using, for instance a pair of thyristors or a pair
of zenner diodes ?
Hey, look at the function of the little relay card in the ASR - and
build something similar. I have two of this modifies ASRs, it's really
nothing special....
Regards,
Philipp.
12:37 p.m.
I am currently modifying my Teletype ASR33 into a LT33
according to the
DEC
specifications to work with my PDP-8/L. Does someone
know what is a
Thyractor (GE 6RS20SP4B4) ? Some kind of voltage clamping device ?.
How could I make one, using, for instance a pair of thyristors or a pair
of
zenner diodes ?
thyractor:
"A marketing name by DAVIS, the thyractor was a combination of a low
loss choke (the reactor) and a thyristor."
I know NTE still markets a replacement for the 6RS20SP5B5 (but not the 4B4).
Unfortunately, I don't have the detailed specs for the 4B4.
On the other hand, I think it is just a handy voltage clamp to keep the
semiconductor circuits from seeing the inductive spikes from the TTY.
Shouldn't be too hard to come up with something else that would work.
Vince
7056
days inactive
7057
days old
2 comments
3 participants
participants (3)
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hachti＠hachti.de -
sonnet＠sols.ucl.ac.be -
vrs＠msn.com