Show the homemade equipment you are using now.

[MrYakimovYA]

This is a ~6 dB,  ~5 MHz amplifier I built with selectable 50 Ohm or "0" Ohm output impedance.

Nice work! It looks so nice! Could you tell me what is its noise level?

[Bud]

It may not be useful to you, because it was a custom design and would not be supported by the usual computer side software and  libraries. I wrote my own for it. And the PIC on the board had a custom firmware that handled communication with only a few old HP instruments that I had at the time, it was not a generic adapter.

It may still be please! I have some LeCroy stuff and software I wrote with serial ports, not realising that it takes 700 seconds to dump all the channels at the thing's top baud rate - so... I'd really love a look

I made mine in 2012, here is a link to the author's web page, seems he released several updates since then.
But he said the speed is 57600 baud.

http://dalton.ax/gpib/

[Bud]

A project from 2003, a dual audio tone generator 700 Hz and 1800 Hz  to check intermodulation performance of Ham radio transmitters (design from an ARRL Handbook of the era)

[DavidAzulay5000]

HP 3325B
HP 8904A
Tektronix 2445
Tektronix 2465
Keysight E3620A
R&S CMU200
keithley 197a
FLUKE 87
hakko FR-801 smd rework station
hakko 850b
quadtech 1659 rlc digibridge

[MrYakimovYA]

HP 3325B
HP 8904A
Tektronix 2445
Tektronix 2465
Keysight E3620A
R&S CMU200
keithley 197a
FLUKE 87
hakko FR-801 smd rework station
hakko 850b
quadtech 1659 rlc digibridge

Wow! What a nice homemade equipment!

[BillyO]

HP 3325B
HP 8904A
Tektronix 2445
Tektronix 2465
Keysight E3620A
R&S CMU200
keithley 197a
FLUKE 87
hakko FR-801 smd rework station
hakko 850b
quadtech 1659 rlc digibridge

Wow! What a nice homemade equipment!

I was thinking the same thing.

[DavidAzulay5000]

HP 3325B
HP 8904A
Tektronix 2445
Tektronix 2465
Keysight E3620A
R&S CMU200
keithley 197a
FLUKE 87
hakko FR-801 smd rework station
hakko 850b
quadtech 1659 rlc digibridge

Wow! What a nice homemade equipment!

I was thinking the same thing.

I bought most of the my equipment broken .
i repaired and calibrated it
I enjoy it the most
to repair measuring equipment

[shapirus]

This is a voltage reference based on a well-known Chinese "LM399" module which actually appears to be staying pretty stable over time. How precise the numbers that are hand-written on it are is quiestionable, but they appear good enough and they can always be verified when there's a chance to use a precision voltmeter. Most importantly, it can definitely be used to check if the DMMs are still all right, which is its primary job.

Inside is a linear power supply and mode selection circuitry that uses relay contacts where a jumper was used on the module's pin header to select one of the six output voltages.





Usage:




And this one's used literally every time I need to try something out on a breadboard or quickly power something up otherwise.
Nothing fancy, just an isolated transformer -> bridge -> caps -> one of those well-known Chinese DC/DC modules.

[jonpaul]

Unearthed in the  # 3 archive, covered in dirt , unused in 30 years.

1980s DIY 3 wide Tektronix plugin TM500 tester PSU, like TM503 but no cage or rails just the PSU.

NPN/PNP on floating HS,  56 pin  genuine AMP card edge connectors are gold plated and spring floating.

Your thoughts appreciated!



Jon

[jasonRF]

I bought most of the my equipment broken .
i repaired and calibrated it
I enjoy it the most
to repair measuring equipment

[tomud]

My old case design for Chinese 150W Constant Current Electronic Load 60V 10A

3D Printing Case Design: https://www.thingiverse.com/thing:4328521

[rfclown]

Rubidium 10 MHz.

[coppercone2]

Small 1A variac. Has fuses and an IEC connector on the back. Needs one more switch on the back, so its possible to isolate the primary when plugged in (I will probobly add a switch + iec this spring). The vents are painted steel grate. One of a few that I have built. But this one is mainly used as a portable source that goes back on the shelf when not in use. And color coding the binding posts is a priority   

I also always wanted to lay in the inside with metal, maybe nickel silver sheet. And a indicator lights for powered and output (which will only work for high settings). Plenty of room for a few things anyway, but that one is not getting meters.

[Kosmic]

My old case design for Chinese 150W Constant Current Electronic Load 60V 10A
...

Mighty good job with the enclosure, I'm impressed 

[rfclown]

Trombone air flow meter (2019) ...

Not that's something I don't have on my bench. Where do you sent it for calibration? I do have a trombone line, but I couldn't find it to take a picture, so I took a picture of a dial phase shifter (same function) and a tuner along with my cornet and trumpet mouthpieces. I don't have any mouth piece to N adaptors though.

[dobsonr741]

5 1/2 digit Autoranging DC voltmeter for 150mV...250V. Built with ADS1263. SCPI control over USB.

[jasonRF]

This is a ~6 dB,  ~5 MHz amplifier I built with selectable 50 Ohm or "0" Ohm output impedance.

Nice work! It looks so nice! Could you tell me what is its noise level?

My scope says about 210uV RMS. This is with 50-Ohm feedthrough on the scope, with the 20 MHz bandwidth limit turned on, and with the amplifier set to 50-Ohm output impedance and the volume control set to max.   The noise level of just the scope is about 160uV RMS with the 20 MHz limit, so the amplifier is at the limit if what the scope can see.  By the way, the scope is a Picoscope 5244B, and I was running it in 16-bit mode at 62.5 MS/s at the most sensitive scale (which is only 2mV/div). 

Jason

[Ground_Loop]

My Unisolder with Pace Accudrive handle that I use almost exclusively.

[tomud]

Vacuum pick and place tool controlled by a foot switch.

Electronics built from what I had in stock (universal board, AT Mega microcontroller, etc.). It has several operating modes, adjustable pump speed, valve opening time, etc.

[MiroS]

A bit of horror is inside.

I fully agree.

[tomud]

My old case design for Chinese 150W Constant Current Electronic Load 60V 10A
...

Mighty good job with the enclosure, I'm impressed 

Thank you for the kind words. I'm not an expert in designing in CAD programs, just an electronics engineer and a programmer. But I try to do projects for a 3D printer as best as I can and I'm still learning.

[Mickle T.]

A portable DCV/DCI/OHMs programmable standard (left) for the "Russian Cal Club" and an upcoming desktop version for home use (right). Both are powered by selected AD5791+LM399 after 5.2 years of electrical/thermal training.

[shapirus]

Yet another dummy load™

This time made for the specific purpose of selecting the least crappy USB cables or USB chargers from those lying around that accumulated over the years.

0..2A adjustable constant current.

[Edison]

Hello, I haven't been here for a long time and I completely forgot about the request to create a thread with my creations, so at least add something here - the latest work is an AC regulated power supply 30V15A
Some photo of the gauges adjustment, done and here it rests with other creations

Nice day 🙂 Tom

[shapirus]

the latest work is an AC regulated power supply 30V15A

Beautiful.
Will you be willing to share the schematics?