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On the Schematic it just shows an SCR it does not give a part number Voltage or Amperage Rating for a Replacement Part. How do you figure out what SCR to use in one of the Pyramid Power Supplies? I have a PS36KX and the SCR is blown and no part number.

I would like to ask, what are you using to clean it?

I got 0.7 to 0.4 voltage at output side . But I plugged on charging it's glow both led and not charging battery but its give 4.1v on charging. But we remove charging than its come to 0.7 to 0.4v

Thanks, continue.

Hi sir, great video, Thanks.

I think HP 5061A uses the same type of regenerative divider, at much higher frequency.

Good job , thanks.

When i tune my sony icf 2010 to a fm station lets say the original frequency of the station is 91.5MHz but my radio will tune it at 91.55 MHz. Any idea what is the issue?

Hello I realize it with altitude and barometer hpa it works fine. I am not an expert at all but all I2C screen are to small and I wish a greater screen but they are in spi interface? also I wish use the push push action to have 1013hpa base or true hpa. Could you please help me for ? Thanks Didier

Hello very intéressant. My altimeter is out. It is my second altimeter failed after 3 years. Were can I find the complete ino file in order to realize a fine an usable altimeter. Thanks Didier

Great breakdown and video thank you for your work! SUBBED!!

Appreciate your work. Ref voltages explanation was missing, lower part of ckt on op amp, which many cannot understand, was not adequate for many technicians, this was the no comment. All are not engineers or high level tech. The explanation that helps, helps them all. Good work. Keep it going strong.

Hey man, really a nice explanation. I have some questions though, Can we connect over email?

Nice build!

Thats so informative...thanks a lot..where are you located..1620 is some me station or you generated it from signal generator

Another capacitor leakage test video This video of video screen replacement is very helpful to me, it deserves praise

Very cool. I have designed something similar for my bench, the build is in progress. The benefits of having everything in one case are huge. Nice build!

Maybe add a geographical methodology to your approach... Meaning, divide the board in two - measure the center of each half - for the half having the lower resistance - half it again - repeat, until the short is located. HTH.

I'm not really familiar with either but is the Boxcar Integrator a predecessor of a lock-in amplifier or do they operate differently?

Hi, great information. is it possible to convert this schematic to measure the resistivity of a semiconductor. I suppose a 4 wire jandel probe as input

Beautiful flight! Sweet landing!

this is great design thankyou for sharing with us

Verygood एक्सप्लिनेशन.

Do you have gerber file for it, or detailed information for creating our own one? Thank you :).

I think your integrator (LTC1049) is missing the charge limiting resistor. At least in the schematic. en.wikipedia.org/wiki/Op_amp_integrator

if provided cicuit ,i could get practiced..

Zeroing the resistance of the leads is, I think, non-negotiable if you are talking about doing accurate sub-ohm readings. I would instead add a button to run your auto-zero functionality which you press when leads are joined, and then shortly after you attach them to resistance to be read. In addition for meter of this class, I think I would be willing to spend the dollars simply on two dual precision opamps in order to make up the four you currently need. 2x OPA2189 or 1xOPA4189, or 2x4522-1 / 1x4522-4 etc.

😊👍🤗 Gut

Great job, man! I've just watched your 3 videos for the miliohm meter project! Thanks for the very useful information (especially about OpAmps)! :)

Great job, man! I've just watched your 3 videos for the miliohm meter project! Thanks for the very useful information (especially about OpAmps)! :)

Great job, man! I've just watched your 3 videos for the miliohm meter project! Thanks for the very useful information (especially about OpAmps)! :)

Very interesting video, and that's some fine 'bodge work' your early results look great on most ranges. The initial wandering about seemed to improve after a switch change could it be some dirty contacts on the wafer switches ? or have you cleaned them all please ?...cheers.

Why not just use the Agilent 34401A meter? It has milliohms (4 wire)

Years ago I played around with ultrasonic transmitter / receiver devices aswell, and also did transmitt audio over the device. I used the 4060 IC to generate around 40KHz carrier frequency crystal controled. I did transmitt that with the transmitter, but not with much power because I do not know how much power these can handle, and I don´t want to damage the transmitter capsule. As receiver I used a mixer, that mixed up the signal into the mediumwave band, so it could be picked up by an AM Radio nearby. The whole unit was AM modulated, because in my oppinion this is superior to FM in this application, because the capsules were built to be resonant at 40KHz with best efficiency there. I used an inductor to couple the RF Signal into the Radio, so I placed the receiver close to the solderless breadboard with the prototype for the ultrasonic receiver, and was able to pick up the signal. The 40KHz Signal was converted to a frequency in the AM broadcast band, let´s say 1040KHz, and the radio was tuned to the frequency. I could get quite some distance of transmission range even with such a basic setup. Over a distance of at least 30-40 feet (without any kind of acustical amplification like putting a cone / cylinder over one of the capsules). Interesting effects appeared, as the ultrasonic sound did receive intefference from wind and other sources, which could be heared in the radio. The converter (40KHz Ultrasonic to 1,040MHz RF) was battery operated, so I could carry the receiver around. Sure has lots of potential. I imagine amplifying the transmitter power sure could give you a range of 300ft if not even more, but like I said, I did that some years ago, and haven´t touched this topic since then.

I did a follow up differential measurement (A-B) on the lock-in amplifier and I got a result of 26.4 mOhms for the device under test. This is the right way to do it if you care about ultimate accuracy from a purely set up point of view.

Love that back-lit meter and all of those knobs!

I would not play with the math on my bench meter (which is 34411,by the way). I would just use the 4-wire method. If there is some problem with that, I would get that fixed. Both your and my meters are recent models and spare parts should be still easily available. In fact, I bought my meter as factory refurbished.

Hi at 2:13 it appears there was some file missing when creating the video. Hope you could fix this in the future. Thank you for the video.

You could easily turn your 34401 meter to your calibration reference. Just measure any of your low-ohm resistor in the offered 4-wire way.

Nice. Subscribed.

really cool repair, I'm glad you went into a lot more specifics in your task to acquire the right transformer. the 600A electrometer seems so much easier to deal with because it doesn't have a mains input and runs on batteries alone. still very cool video thank you for sharing

Appreciate the inside inspection. Good to compare to my bertan 313a which i can't find schematic for.

The foot step doesnt go away? I thought it gets sucked in

Normally never before 500 feets to retract the flaps. Nice video. I am not IFR it’s too hard for me !

Hi sir, many thanks for this excellent video!! Greetings from The Netherlands, Willem Twee Studios

very good explaination thank you a lot!

🌈 ρгό𝔪σŞｍ

I kept using the terms "noise" and "uncorrelated" loosely. The boxcar integrator will reject harmonically unrelated signals or wide band noise that may be present on top of the signal of interest. Uncorrelated here is same as non-harmonically related components which over the sampling period don't contribute to the signal to be recovered. Pink noise or band-limited interfering signals will contribute to the averaging and skew the result.

The shaking isn't too bad or distracting. I would suggest a longer screen time for the longer pure text portions - some disappeared before I could finish reading. Also better contrast or boxed text for the running commentary. Finally, a pointer to point at things to correspond to the comments may be helpful

Very nice video and easy music! Thank you for sharing !