DSO138 2 pin male connector - what is it?

[NikJ]

Hi

Total newb & first post. I bought an assembled DSO138 and what to connect it to a 9v battery. What is the male plug that I need for the white 2 pin connector and can I buy it in less that vast quantities?

Thanks!

[Vovk_Z]

Which connector are you talking about, NX2500-02?

[jpanhalt]

Apparently, you have 2 choices for power.  The circular connector and 2-pin connector are wired in parallel.

The 2-pin connector is characterized by its pin spacing.  My guess is that it is 2.54mm/0.1".  Then you need to find a matching plug that is keyed so it cannot be inserted wrong.  JST, Amphenol, Molex and others make them.  Finding a matching plug for the circular connector might be easier. Center pin is positive.

[NikJ]

Thank you! The barrel connector looks like I can buy singles, rather than tens or hundreds of the 2 pin 

[tooki]

The power header is a JST XH connector. One of the most common connectors in the world. Absolutely not something where you’d have to buy hundreds or thousands. Or even tens. You can order a single one from Digi-Key or any number of resellers. And clones are insanely cheap on AliExpress.

[HwAoRrDk]

Be aware that if you run the DSO138 from a 9V battery, when the battery gets low, you will start to get incorrect waveform levels. If memory serves, it's to do with the negative voltage reference circuitry not working properly below about 7.5V.

And regardless of method of power supply, you cannot give it less than 7V anyway because it uses a 7805 regulator for the 5V rail which has a 2V dropout voltage.

[Gyro]

You would be better to use a 6 (or 8 )* x AA battery holder with NiMh rechargeable batteries. The end voltage isn't so much of an issue then because you can just recharge them.

I did a write-up on the JYE DSO138 Forum a few years ago on how to reduce the minimum supply voltage. With all modifications, I managed to get it down to 5.4V. Note that I really wouldn't attempt this unless you are experienced - particularly the removal of the reverse supply protection diode!

https://forum.jyetech.com/viewtopic.php?f=18&t=744


EDIT: * I can't remember whether the regulator gets a little too hot at 12V.