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Hi, I know with a generic resistor to measure the resistance accurately it should be disconnected from the circuit and measured by itself. I am trying to measure the resistance of an NTC over time in a live circuit. I want to create a plot of the NTC temperature vs NTC resistance over time...
Hi Klaus,
I understand theory is important. Without theory, you can't do anything. What I was looking for is a book on:
"Practical design techniques that focuses on common circuit design challenges"
Thanks!
I learned circuit theory in college but college courses tend to stick to theory with a little design.
Are there any good electronic books that focus on (teach) electronic circuit design and not so much electronics theory?
Thanks so much! :thumbsup:
KlausST,
Just to be certain, the equation to calculate the resistor value would then be:
R = (Vmax load off)/ (I leak)
where Vmax load off = the max load needed to make the load stay off
I leak = leakage current of relay
Is this equation correct?
Thanks for you help.
I have a Solid State relay that is controlled by a digital output which turns on and off 120Vac supply to load.
When I enable the relay with digital output (SSR = ON), the measured AC voltage on the load = 120Vac.
When I disable the relay with digital output (SSR = OFF), the measured AC voltage...
Are there any good basic examples on how to design an op amp with associated circuitry to amplify current from a shunt resistor?
I am trying to figure out how to setup the op amp and its circuitry. Thanks!
When measuring a voltage with a DMM does the the DMM see the current across the two points probed?
For example, if I have a circuit that draws 2.5Amps across a load. If I measure the voltage across that load, do I need to worry that I will damage the DMM because of the 2.5A current flowing...
I understand the following for Relays:
• Maximum Switching Current - The maximum current which can safely be switched by the contacts.
• Maximum Carrying Current - The maximum current which after closing or prior to opening, the contacts can safely pass without being subject to temperature...
If I put two resistors in series (load 1) that are both power rated at 50W, does that mean the power rating over the resistor load 1 becomes 100W (meaning I just add the the power ratings of the two resistors)?
If I put two resistors in parallel that are both power rated at 50W, what does the...
Hi everyone, I need to measure analog voltages and want to isolate them from my measurement system to prevent any potential damage. The analog voltages being measured are +/-10V max.
Can anyone suggest any good Isolated Analog Voltage Input Modules? I'd like to find a module that supports at...
esp1,
The application for the relay module is to switch in AC voltages from values of 105VAC-215VAC. The max load is 3A. As FvM mentioned, we don't really think the opto coupler has any use in this. Do you know what is the main reason for it?
Thanks!
I was able to find a schematic for this relay device (see below). I see it has a feature for the input control pin to be optically isolated from the relay control input.
What is the purpose of this? How could the input pin get damaged if the relay contacts themselves are already electrically...
I am looking at the following relay board:
https://www.sainsmart.com/8-channel-dc-5v-relay-module-for-arduino-pic-arm-dsp-avr-msp430-ttl-logic.html
It mentions that each relay needs 15-20mA Driver Current. What exactly does that mean?
Thanks!
Simulate Simple Battery Load
I have a battery charger circuit that I want to test out. I do not want to use an actual battery to test. I would like to use a power supply. My power supply however does not allow sinking any current. Instead, I was going to put a load on the battery charging...
Hi everyone, I am trying to simulate a battery with a power supply. My power supply DOES NOT have sinking current capabilities. I need to simulate battery charging with a power supply and measure the battery current while charging. Since my power supply does not have sinking current support I...
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