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MrYakimovYA:

--- Quote from: inse on January 20, 2023, 06:23:11 am ---@ MrYakimovYA #36 Reply
Do you need special connectors and cables to handle 100GOhms without compromising the measurements?

--- End quote ---
No, I have no triax cable, so I use just a common coax. The metallic shield, metal case are used as a guard. So I can't see any problem. I tried to draw all these ideas at the attached picture) Where Il@Rl1 - leakage current throught RL1; IL@RL2 - leakage current throught RL2.

RL1, RL2 - leakage resistance of input and output coaxs.

All ideas had been taken from: https://www.tek.com/en/documents/product-article/keithley-low-level-measurements-handbook---7th-edition
MrYakimovYA:
I use it quite widely. I check the ability of something with linear transformer inside to work from wallet outlet. I also can have a high voltage to check leakage current or measure something above 1G, for example.
Njk:
It took a time to locate it, but I did. Because of peculiarity of the thing.

Compact water-cooled rectifier CWCR-001, of my design. For testing a 12/24V automotive stuff (DC motors, etc.) in the lab. Features:

- small form factor, easy to keep when not in use;
- 10A diode bridge inside;
- ISO 4165 DC output socket.

Before use, put it in a jar with cold tap water. Watch the temperature, replace the water when necessary.

Machined from an aluminum piece by my best manufacturing partner, a decades ago. Developed some internal rust (stainless screws were not available) but still works.





vinlove:
AD9850 DDS RF generator kit.  This was simple and easy build needing just a soldering iron, wire stripper, plier, nipper and screw drivers.

About 5- 7 years ago when I had an old Ten Tec Omni with seized up VFO, this unit connected to the external IF port of the Omni, and drove the TenTec nicely making tons of HF contacts.  The TenTec Omni had been sold, but this self built AD9850 DDS VFO controller / RF Generator is still here.  It had not been used for few years now.   I am planning to build a HF receiver using this kit.



amc184:
I built a couple of USB to UART adapters because I wasn't that happy with what I could find off the shelf.  One is isolated RS-422, with DC to DC converters to supply the device side.  The other is plain UART, with the option of host powered 3.3 or 5V levels, or isolated with a device defined level.









Both use a CoreChips SL2.1A as a USB hub and a Holtek HT42B534-1 USB to UART converter.  I chose both because they did what I needed and were simple to implement.  I used an Analog Devices ADUM1201 for the isolator, and a Sipex SP490 for the RS-422 version.  They work well now, but I had to do a couple of spins to get them right, and spent way more time than I should have on a side project - the story of my hobby.
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