Good day to all I hope everyone is well. So iam quite new to soldering and I ordered 2 diy voltmeter 7107 diy voltmeter from aliexpress but in both kits they haven't included a part called resistor 11 and its screened as R11 2w0.1 it as heat sinked tracks underneath and as 3 hole option can enyone tell me where to find a couple eny help would be appreciated please see picks is there a different name

 

hi Damian,
Welcome to AAC
It is a 0.1 Ohm, 2 Watt.
Try eBay.


https://www.ebay.co.uk/sch/i.html?_...l1313&_nkw=0.1R+2+Watt+resistor&_sacat=181912

https://www.ebay.co.uk/b/Power-Wirewound-Fixed-Resistors/181912/bn_7030234588

E

 

hi Damian,
Welcome to AAC
It is a 0.1 Ohm, 2 Watt.
Try eBay.


https://www.ebay.co.uk/sch/i.html?_...l1313&_nkw=0.1R+2+Watt+resistor&_sacat=181912

https://www.ebay.co.uk/b/Power-Wirewound-Fixed-Resistors/181912/bn_7030234588

E

Thank you for a quick reply I will get onto it straight away tc be safe

 

Those low-value sense resistors (presumably precision) can be relatively expensive. A conventional supplier (e.g., Digikey, Mouser, Arrow, Newark, Farnell) may be cheaper in small lots and provide traceable devices.

 

Good morning all I hope your well I have a question firstly I purchased 2 diy voltmeter projects iam stuck on a part as instructions are in Chinese characters il pop a pick in the part just says R6 RK but no value can enyone help please Thankyou for your time Damian

 

Hello,

To look at the schematic, it is a current measurement.
If you want good accuracy, take a precission resistor.
This ia an 1% resistor for example:
https://www.ebay.com/itm/1PCS-Resis...233517?hash=item25e665fced:g:68EAAOSwb3laHjyt

Bertus

 

I believe R11 is the sense resistor. R6 looks like some sort of offset (meter zero, calibration?), particularly since it is in series as a voltage divider with a non-precision pot.

 

Thank you for a quick reply I will get onto it straight away tc be safe

I ordered 5 from ebay £4.50 including delivery

 

Good morning all I hope your well I have a question firstly I purchased 2 diy voltmeter projects iam stuck on a part as instructions are in Chinese characters il pop a pick in the part just says R6 Rx but no value can enyone help please Thankyou for your time Damian

ps there is a trimmer pot coming of it

 

Good morning all I hope your well I have a question firstly I purchased 2 diy voltmeter projects iam stuck on a part as instructions are in Chinese characters il pop a pick in the part just says R6 Rx
but no value can enyone help please Thankyou for your time Damian

 

Hi guys to make right eny confusion the part iam looking for are R6 it as no value but as letters rx it is coming of apot please see picture srry if I've caused confusion iam new to forums and electronics eny help would be appreciated

 

hi Damian,
Please post a full circuit diagram image, so that we can see the complete circuit.
E

 

hi Damian,
Please post a full circuit diagram image, so that we can see the complete circuit.
E

Sure

 

hi,
Looking a the 7107 datasheet it shows the input resistor R5 as a 1meg Ohm, look at the attached datasheet. Figure #2
I would try Rx as a 1meg as a starting point
E