Dont use the current mirror without emitter resistors; it will likely be
inaccurate with discrete devices.
The current mirror as shown uses the operating point of Q2 (which is very
controllable and stable) to set the current through Q1. The problem is that
in this configuration, Q1's collector
I have:
IN-14 – 81 pcs. for $5,
IN-14 used – 8 pcs. for $2.5
I can send by express mail - 2 week for delivery from Russia.
среда, 29 марта 2017 г., 20:00:29 UTC+3 пользователь Terry S написал:
>
> Has anyone in the states got a long leaded IN-14 to "front" me?
>
> I'm fixing another clock for
I have:
IN-14 – 81 pcs. for $5,
IN-14 used – 8 pcs. for $2.5
I can send by express mail - 2 week for delivery from Russia.
.
среда, 29 марта 2017 г., 20:00:29 UTC+3 пользователь Terry S написал:
>
> Has anyone in the states got a long leaded IN-14 to "front" me?
>
> I'm fixing another clock
It’s not the insertion of the tube that worries me, but the long term stress
due to slight misalignment of the bushings. That concerns particular hydrogen
and helium filled tubes. Keep in mind tubes like EZ10A and B have a very dense
13 pin socket that needs narrow tolerances in alignment. It’s
There are lots of inexpensive isolated DC-DC converters. I've been using
products from Cui and Recom. Here's a 12V unit I use:
http://www.digikey.com/product-detail/en/VIBLSD1-S5-S12-SIP/102-1432-ND/989887
They are available in all sorts of input and output voltages. Be careful
that some
I do mine in 2-steps:
- Low-insertion socket pins soldered to PC bpard
- 3D-printed collar that sets over the pins. It's mostly for aesthetic
reasons, because the pins dont fit snugly into the collar. The collar
certainly helps guide the tube into the socket. However, you should
I think he was talking about a -5supply that you make from a low voltage AND
that both rails of teh 5V supply are insulated very well from earth/ground.
ie Floating.
Then you can wire each of its leads to a place that could be a voltage well
above [or below] earth/gnd. Let's wait for him to
What is the latest on low stress sockets?
3D printer ones coming along?
I am keen to hear from you all about the latest successes.
Anyone contemplating a ZIF style - either rotate or slide locking etc?
John K
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I suspect that he meant if you wanted the 1ve supply, then the devices he
mentioned give it easily directly from your low voltage supply - I don't
think he meant you to use up your precious High Voltage. Presumably you are
running the high voltage generator DCDC conv off a low voltage? You
If I just look at all of the circuit diagrams for various current limiters, it
begins to seem like any combination of a couple of transistors and a bunch of
resistors works! Hence my need to do some 'practicals', it makes me go in to it
all in enough depth to actually begin to understand.
BTW,
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