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$20 LCR ESR Transistor checker project

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gipetto:
there are 8051 mcus widely available. they tend to be more ram limited than the current atmega (300 bytes) due to  their age, but they're much cheaper. some have 64k of flash. If you wanted to avoid the scarcity issue it would be a good way to go.

indman:

--- Quote from: thm_w on March 27, 2023, 10:55:21 pm ---Can't believe there is still no STM32 or other high end port of this tester. Some regular alix models are selling for $30.
Anyone here working on it?

--- End quote ---
There is such a port and it is called DSO-TC2. And now, Chinese friends have launched an updated version of DSO-TC3 on the market, in which they added a signal generator and also taught how to measure the ESR of capacitors.
It is interesting to look at the circuitry of this clone and find out how it is possible to match the power supply of the STM with checking parts with a higher voltage?  :D

Feliciano:

--- Quote from: 9voltbrain on March 27, 2023, 11:40:56 pm ---The battery that comes with it is already lower than 5V (3.7), so how would this be more of an issue with AAA? When the battery voltage drops too low for it to regulate to its desired operating voltage, it's going to tell me to "charge", then I'll just change the batteries. Am I missing something?

--- End quote ---
Similar to a power bank, your ctester comes with a 3.7V Li-Ion charger and boost converter to 5V, designed to operate within 4.2V to 3.2V or so. A new set of 3x AAA can be between 4.8V full or 2.7V flat.

As I said, if you connect the alkaline batteries directly to the main MCU you will have a lot of trouble. And if you connect it to where the actual battery is, you would have to check whether that IC supports 5V Vbatt (and put a tape over the microUSB input), and how it would be behave under that scenario.

Let's say it does: If your ctester shut off at 3.5V, you would be replacing alkaline batteries with around 45% of charge remaning.

madires:

--- Quote from: 9voltbrain on March 27, 2023, 07:53:31 pm ---About the LCR-T7... The rechargeable battery is making me a little paranoid, plus I think it's annoying having to keep it charged, so I'm thinking of replacing it with AAA-batteries. How hard would this be? Would I need to regulate the voltage down from 4.5 volts (3xAAA), or can it handle 4.5? The rechargeable battery is 3.7v.

--- End quote ---

You could add a simple switch to prevent discharging by the control MCU. When going for the AAA batteries check if the Li-Ion charger chip will be happy with the higher voltage or needs to be removed. The second thing to check is the control MCU. The STC15L104W is rated for 2.4 to 3.6V (STC15F104W 3.8 - 5.5V).

Cliff Matthews:

--- Quote from: indman on March 28, 2023, 08:12:13 am ---
--- Quote from: thm_w on March 27, 2023, 10:55:21 pm ---Can't believe there is still no STM32 or other high end port of this tester. Some regular alix models are selling for $30.
Anyone here working on it?

--- End quote ---
There is such a port and it is called DSO-TC2. And now, Chinese friends have launched an updated version of DSO-TC3 on the market, in which they added a signal generator and also taught how to measure the ESR of capacitors.
It is interesting to look at the circuitry of this clone and find out how it is possible to match the power supply of the STM with checking parts with a higher voltage?  :D

--- End quote ---
TC3 first looks here I think

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