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Took out the EKL part and measured the resistance putting the neg lead on the positive pole to read just the resistance of R2. It was 19.5k ohms just like PsiDoc said; so he was right! Then I put the pos lead on the pos end of the device and read 21.5k ohms.

Now the fwd resistance thru a 1n4148 diode is ~180k ohms when tested. So in parallel with a 20k resistor, it should read 100k ohms. What is it that I don't understand? Doesn't make sense; what did I miss? What about the diode resistance; is that where I got the wrong picture?

Don't have any 100k resistors ATM . . .

<blockquote data-quote="Robb" data-source="post: 479055" data-attributes="member: 8446">Took out the EKL part and measured the resistance putting the neg lead on the positive pole to read just the resistance of R2.&nbsp; It was 19.5k ohms just like PsiDoc said; so he was right!&nbsp; Then I put the pos lead on the pos end of the device and read 21.5k ohms.Now the fwd resistance thru a 1n4148 diode is ~180k ohms when tested.&nbsp; So in parallel with a 20k resistor, it should read 100k ohms.&nbsp; What is it that I don&#039;t understand?&nbsp; Doesn&#039;t make sense; what did I miss?&nbsp; What about the diode resistance; is that where I got the wrong picture?<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":confused1:" title="Confused&nbsp; &nbsp; :confused1:"&nbsp; data-smilie="5"data-shortname=":confused1:" /><img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":unsure:" title="Unsure&nbsp; &nbsp; :unsure:"&nbsp; data-smilie="28"data-shortname=":unsure:" /><img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f633.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":oops:" title="Oops!&nbsp; &nbsp; :oops:"&nbsp; data-smilie="10"data-shortname=":oops:" />Don&#039;t have any 100k resistors ATM . . .</blockquote>

[QUOTE="Robb, post: 479055, member: 8446"] Took out the EKL part and measured the resistance putting the neg lead on the positive pole to read just the resistance of R2. It was 19.5k ohms just like PsiDoc said; [B][I][U]so he was right![/U][/I][/B] Then I put the pos lead on the pos end of the device and read 21.5k ohms. Now the fwd resistance thru a 1n4148 diode is ~180k ohms when tested. So in parallel with a 20k resistor, it should read 100k ohms. What is it that I don't understand? Doesn't make sense; what did I miss? What about the diode resistance; is that where I got the wrong picture? :confused1: :unsure: :oops: Don't have any 100k resistors ATM . . . [/QUOTE]

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