No, the illness is tellurium copper terminal.
the KVD is so tempting (and would be useful), but the damn rotary switches .... there is none in the "cheap end" of product that would suffice as far as I have been searching in a few catalogs.
Now what I buffer each decate with sufficient type OPA and add offset trim as in "calibrated pot" scheme from days now gone. Then I could use 10k resistor in each decade as the buffer prevents them to see each other electrically. I wouldn't need to go smaller and smaller values in each decade and became a victim of the contact resistance fluctuations. This solution naturally restricts the divider to only low voltages inside the operation range of the buffers
Quotethe KVD is so tempting (and would be useful), but the damn rotary switches .... there is none in the "cheap end" of product that would suffice as far as I have been searching in a few catalogs.Have you looked in ebay?
I found a number of vendors selling dual gang rotary switch - quality - do not know.
eg
http://www.ebay.co.uk/itm/Band-Channael-Rotary-Switch-2P11T-2-Pole-11-Position-Dual-Deck-E8I-/182406735547?epid=1487137967&hash=item2a7849e6bb:g:t6kAAOSw5cNYaRy-QuoteNow what I buffer each decate with sufficient type OPA and add offset trim as in "calibrated pot" scheme from days now gone. Then I could use 10k resistor in each decade as the buffer prevents them to see each other electrically. I wouldn't need to go smaller and smaller values in each decade and became a victim of the contact resistance fluctuations. This solution naturally restricts the divider to only low voltages inside the operation range of the buffersOnce you deviate away from the ratio of one decade to the next - you no longer have a KVD (you do realize that dont you?).
The genious of the KVD is that each decade seeing a perfect decade divide down (do the maths on resistor parallel and series combination and you will see what I mean). It also means that ALL the resistors MUST be exact match value wise and temp co AND each decade ration MUST be exact.
Good luck with your recovery
It seems that I finally got the volt-nuttery infection.
...
Is there any cure for this illness?
By all means, fix the reticle illumination IMMEDIATELY!
Otherwise, your mind will deteriorate and you will have an urgent desire to purchase a brand new oscilloscope.
You will have nightmares, you will have hallucinations.
Until one day, innocently browsing the internet you'll find an oscilloscope you cannot resist! The road to perdition leads from there.
But to tell you the truth, it is a sweet, sweet road.
the KVD is so tempting (and would be useful), but the damn rotary switches .... there is none in the "cheap end" of product that would suffice as far as I have been searching in a few catalogs.
No, the illness is tellurium copper terminal.
the KVD is so tempting (and would be useful), but the damn rotary switches .... there is none in the "cheap end" of product that would suffice as far as I have been searching in a few catalogs.
What about using relays? Then the switches can be cheap or implemented digitally.
No, the illness is tellurium copper terminal.
Google "tellurium breath"... fun stuff.
Vtile that circuit is more an architectonic masterpiece.
That's nice. I usually grind out isolated pads with a burr, but the small pieces of circuit board are way better.
hello,
1N823A is not a burried zener, it is simply a glass sealed/passivated temperature compensated zener.
regards.
-zia
I wonder if there is any benefit for these pads as they create a small capacitor to every circuit node. On the other hand I do not have equipment to measure the noise anyway.
I wonder if there is any benefit for these pads as they create a small capacitor to every circuit node. On the other hand I do not have equipment to measure the noise anyway.
If the capacitance serves to make the prototype a more accurate representation of the production model then it does. I have seen the same construction technique used with strips cut to a width to make 50 ohm microstrip transmission lines for RF work. If low capacitance and leakage is required, then just air wire those nodes.
How did you connect the pads to the copper clad board? Glue? Solder?
I was thinking of laying out tiny boards with various surface mount footprints with pads only on the top and maybe pads for common things like local decoupling. Corner or edge plated through hole pads could be soldered from the top or side for attachment to a copper clad board below.
Did someone had a look on 1N4569 (0.5mA), 1N4574A (1mA), 1N4579A (2mA) or 1N4584A (4mA)? They are temperature compensated zeners with 5ppm/K. Sure expensive, but available at Mouser, ... and fabricated by Microsemi.
I wonder how their noise performance looks like, since there is no specification given in the datasheet.
-branadic-
njsemi makes temperature compensated zeners with tested noise specs.
check out the following with a guaranteed 0.2 uv/rtHz noise.
http://www.njsemi.com/parts/1N4908A
regards.
-zia
Vtile that circuit is more an architectonic masterpiece.Thank you.
It is the byproduct of the enormous amount of resistor I had to use to get the obscure ZeroTC current value for theburiedtemperature compensated zener and then the gain set for the OP.
..But manhattan style ref. board looks nice.
That's nice. I usually grind out isolated pads with a burr, but the small pieces of circuit board are way better.Heh, I would have done so also, but I still do not have the tool for making those islands. ...And I'm too cheap to buy one.
I wonder if there is any benefit for these pads as they create a small capacitor to every circuit node. On the other hand I do not have equipment to measure the noise anyway.
That's nice. I usually grind out isolated pads with a burr, but the small pieces of circuit board are way better.
That's nice. I usually grind out isolated pads with a burr, but the small pieces of circuit board are way better.
Careful dremelling can allow SMD devices with >=3 pins to be directly accomodated.
The glued-on PCB tiles can be used with 2-pin SMD devices, e.g. decoupling capacitors tilted "precariously" at 45degrees to the plane.