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If you print 23n823 Thing and display it in public proudly give attribution by printing and displaying this tag. If you are looking for the KP the appendix E should be given. Reed Relais general It has a contact inside of the tube. The tube has the air evacuated or it is filled with protective gas. Outside sits a coil that agitates the vatasheet inside the tube magnetically. You are on your own finding a suitable reed relais. The contact should be closed normaly when the coil is not activated.
If it has the contacts normally open the default mode seen in the schematics will be reversed. Some GdR made reed relais families varying in mechanical and electrical specs do exist still. This does not match n. Funkamateur, Heft abbreviation: FA The “FA” is now a western owned magazine, exists still. It provides now HAM operators mostly. If they do complain I could find the sources from the manufacturer published in the “radio fernsehen electronic” as well.
RGK20 9volt version https: RGK20 12volt version https: RGK20 18volt version https: Take care on the coil voltage, there do exist many different versions. I will use two 6volt relais in series with a resistor to fit the 20 volt from the psu. The 24volt relais or 2x12volt in series is possibly a bit over to much, do not know.
Making of the pcb: Transfering to both sides concurrently was a one shot only job. Made a bag from the two sides sheets. Put the copper clad in, fed it dxtasheet the laminater.
Unfortunaly the bag has gotten ripped off by datasheeg through. But the toner had grip enough to not fall off. Did a number of following passes using freshly cut to size blank baking paper sheets then. If it would work like in laserprinter this could be done by simply feeding the pcb trough.
But I wanted not to put risk on the work done before. Tonertransfer works dataeheet enough, helps avoiding using much chemicals or making noise and dust on the cnc mill. Some graphics can be read better by selecting the expanded full view. Tick the 45 degree tilted cross overlay in the upper right corner of a picture.
Having opened the expanded view there is a line “View Original”. Ticking this should bring up the saved file in full size to the screen.
Some pictures from the book are realy poor to view or even missing. Have made new design files using “Sprint Layout” Abacom Germany I’m not about to build the case as shown by the pictures. This build is not intended to compete with digital voltmeters regarding accuracy. You might own a datahseet of them. It is about rebuilding a very well made DIY project from the late 70s. Get back the benefit of using analog gauges, perfectly showing trends.
It is dead easy to see if a value is inside a specified range. Hard 2j3823 see from digital multimeters. Datashest using switch mode psu.
Specs as of the authors build. Feel free to modify the input devider resistor datasueet. The schematics could be simplified if you want DC mode only.
If looking for something else take care on leakage current in reverse mode. Should be as low as possible. The diodes are grouped in antiparellel series 4 each.
2N Datasheet(PDF) – Microsemi Corporation
This builds the input overload protection. Why not using Z-diodes? Z-diodes would reduce the impedance because of leaking current. I will put the basic instructions regarding some construction details and the inital adjustment here later. I made a simple build many years ago unshielded. The meter had the frontplate made from a sheet of aluminium only. It was extremely daasheet against changes of the near field. It moved the pointer in the dataseet even by moving my hand toward the meter.
Same effect can be seen with radio frequency circuits. Make a good looking representation of your designs and skills ;- Show off your design work not limited to datahseet desing even animated in 3D. Method 1 making a representation of your design artwork the traditional way, processing pictures in pixelgraphics software only.
Have repaired the dxtasheet using the layer mode in Gimp. Pictures of both sides of the pcb loaded into Tinkercad. A screenshot makes the picture suitable for presentation purpose.
For some details see Method 2 below. If it gives you some joy and inspiration, then all is good.
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This thing is still a Work in Progress. Files, instructions, and other stuff might change! Download All Files 4 1 0 0 0 0. Tags pcb visualization voltmeter.
build a FET voltmeter (KP303E,BF245,2N3823)
Liked By View All. Give a Shout Out If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Thing Statistics Views. The shortest possible description after a proposal given by reader Datssheet Now it gets closer to make something real. I have etched the doublesided pcb. The RGK relais do exist still. Can be had on ebay.
The files Some graphics can be read better by selecting the expanded dataeheet view. Stupid, but if it works for you this way, go with it. To keep the input impedance high and reduce leakage some industrial grade parts are required. The input selektor should be made from ceramic The mode switch relais should have the contacts perfectly separated when opened. Look for “Reed contact Relais”. The name depends on your language a bit.
The author gave instructions how to make one DIY. Some explanations on the parts used in the schematics: Germanium diodes could be replaced with low power shottky diodes probably.
Find a data sheet and check it out.
Consider using a matall chassis of the same type as used in tube amplifier builds. See the pictures of the completed build made by the author.