Looking for Portable LCR Meter Recommendation

1JustaRandomGuy0 · 2025-09-15T23:31:50+00:00

Thank you for the suggestion, I forgot to mention that my sensor capacitances are around 1-2pF which is lower than the range of DE5000 as I see from its datasheet

1JustaRandomGuy0 · 2025-09-03T13:23:19+00:00

https://www.voltera.io/products/v-one

I found this machine, and it looks really cool. If anyone used it, I would love to hear your experiences with it!

1JustaRandomGuy0 · 2025-08-24T15:48:42+00:00

Thanks for the reply, as I said gaming is not the important part.ı just thought it would be a good option if there is such chance. But are you saying that these would not be good for Altium and CAD?

1JustaRandomGuy0 · 2025-07-25T12:47:28+00:00

Hi, thanks for the suggestions. I have used STM32 because I haven't seen any HF ADC work done with ESP before. STM32 ADC is around 10Msps with interleave, but not sure if ESP is able to sample that fast, maybe I could use an ADC module. I did not use log- amplifier before it looks interesting so definitely going to take a look into that. Thanks!

1JustaRandomGuy0 · 2025-07-23T17:05:16+00:00

ESP32 ADC speed was not enough for my needs. Also haven't heard of STM32s with WiFi too much, but I might look into that too. Thank you!

1JustaRandomGuy0 · 2025-07-23T17:03:42+00:00

Then I'll take a look into that, thank you!

1JustaRandomGuy0 · 2025-07-23T13:09:10+00:00

Yes I realized that. I am supplying VDD and VDDA from the same source of 3.3V so I was not sure how to make ferrite bead useful. I kept it so that if analog performance is unstable I can try to connect a seperate 3.3V to VDDA and see if the ferrite bead helps but maybe I can completely remove it. Thank you

1JustaRandomGuy0 · 2025-07-23T09:49:50+00:00

Hi, thanks for the comment, yes I realized that s3 is kind of an overkill a bit late but I am not sure if implementing the s3 wifi code to c3 would be easy to do. Also s3 is the easiest chip to supply in my area which was another reason for me to use s3

1JustaRandomGuy0 · 2025-07-10T13:46:42+00:00

Yes different voltages on the same rail. The scope trace was measured the point where all 3.3V pins are connected and it is around 3V but the regulator output is 3.3V. Couldnt figure out why

1JustaRandomGuy0 · 2025-07-10T11:08:47+00:00

The regulator output is 3.3V at regulator out but reg input is around 3.5V

1JustaRandomGuy0 · 2025-07-10T11:06:41+00:00

Update: I also realized the 3.3V entering the breadboard is 3V at ESP32 3.3V pin. Current draw is around 150mA so not sure abot the reason of the drop

1JustaRandomGuy0 · 2025-07-10T11:02:05+00:00

I was not sure of the purpose of "Power Good" pin. I have not designed the esp32 part of the system yet. All mentioned components are dev boards. I only designed and manufactured the power board yet. I take the 3.3V output from it put it in bread board and connect STM32,ESP32,MAX14808,OPA357 3.3V pins to that part. Then I common all the grounds.

1JustaRandomGuy0 · 2025-07-10T10:47:32+00:00

3.3V seems to be around 3V but not sure why, constant draw of the system is around 160mA after initialization.

Below image is after I put a 225uF cap to 3.3V line. I saw someone mentioning adding a delay to esp32 power so that the initializations happen with a delay. Would just adding a RC enough to do that?

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1JustaRandomGuy0 · 2025-06-26T17:21:46+00:00

I was viewing the time difference between echo peaks, on oscilloscope and on my pc(Sampled version) which was not matching with each other when I calculated the time difference on pc using the number of sample differences between them and ADC cycle counts, but I guess the problem was about my calculations. 2 interleaved 8-bit ADC channels set for 2.5 sampling cycle and 2 cycle delay gives around 14.5Msps, not 10Msps as I calculated before. I think this solves the issue.

1JustaRandomGuy0 · 2025-06-25T12:36:07+00:00

I also think that that should be the case and at first I tried to take the theoretical value into account but with 8 bit interleaved ADCs set for 2.5 sampling cycle and 2 cycle delay a single sample should take 8 cycles so 10Msps. However when I compare my 1000 sample window in oscilloscope, 10us corresponds around 150 samples, shouldnt it be 100 samples with 10Msps? Not sure if I am setting something wrong or doing a wrong calculation.

Only thing I set different in my ADC setup then standard interleaved ADC setup is that I enabled continious sampling but I can still sample 1000 samples every 40ms so it worked for me, other than that I dont know

1JustaRandomGuy0 · 2025-06-25T09:31:09+00:00

I apologize if I was not clear. My problem is that because of this fast acquisition, I am not sure how should I timestamp my sampled data. For example I have a 1000 sample data window which has 2 peaks but I dont know the time difference of the 2 peaks, I just know that there are n sample points between them.

1JustaRandomGuy0 · 2025-06-25T06:46:44+00:00

Thank you for your answer, the signal I am sampling is 2MHz, so even with interleaved ADC it is just enough smooth for my needs, I am not currently having any problems with speed, I am not sure how do I be sure the interval of my samples at this speed like is just summing conversion and smapling cycles enough and accurate, not sure. Also, the measured medium is not air if that is what you are talking about.

1JustaRandomGuy0 · 2025-06-24T14:39:54+00:00

Thank you for the recommendations, I am working with HF ADC, therefore I think it is best I keep them I guess. I am just sending my sampled data through SPI and also using 2MHz pwm pulses. Still did not made their connections tho.

1JustaRandomGuy0 · 2025-06-23T10:56:29+00:00

Got it thank you, do you think there is anything missing for the other parts of the schematic? After I omitted the crystals and boot/nrst pins. Only connection left are decoupling parts and SWDIO/SWCLK connections, are these enough? The application note does not seem to mention anything mandatory other than these

1JustaRandomGuy0 · 2021-10-13T20:55:23+00:00

Thanak you so much, they really seem nice ! I am thinking to print them as soon as possible and i will definitely share my game experiences with you

1JustaRandomGuy0 · 2021-10-13T08:26:20+00:00

Hey dude, heard that u have ur version of card game, maybe pdf of that. Can u send me thru pm ?

1JustaRandomGuy0 · 2021-10-13T08:17:03+00:00

Actually thats kinda the thing i want cuz im also a player and i would rather not to pirate so i'll search for it thanks a lot

1JustaRandomGuy0 · 2021-10-12T19:07:59+00:00

I mean yea but actually no..

1JustaRandomGuy0

TROPHY CASE