Voltage divider
Cenlasoft
Posts: 265
Hello,
I am having problems trying to lower a volatge down to a level that I can use with the ADC0831. Attached is an LC circuit that works. What you see in the jpg is from a simulator, but I have built this circuit and I get lower values for voltage at T1 (120 v pp). I want to attach a diode at T1 and then divide the volatge to get a voltage for use on the ADC. I have tried, it seems the diode brings down the volts too low before getting to the divider. I have used two types of diodes (radioshack).
Thanks,
Cenlasoft
I am having problems trying to lower a volatge down to a level that I can use with the ADC0831. Attached is an LC circuit that works. What you see in the jpg is from a simulator, but I have built this circuit and I get lower values for voltage at T1 (120 v pp). I want to attach a diode at T1 and then divide the volatge to get a voltage for use on the ADC. I have tried, it seems the diode brings down the volts too low before getting to the divider. I have used two types of diodes (radioshack).
Thanks,
Cenlasoft
574 x 311 - 38K
Comments
1- Any load on a resonant circuit will lower the Q and cause the voltage to drop. The higher the load the larger the drop.
2- A diode has capacitance and will affect the resonant frequency of the circuit.
Connect the largest value resistor possible to T1, then the diode, and then the smaller resistor going to ground.
That worked. I have attached the circuit and I will put it on a breadboard now. If that works, I will send the T2 output to an ADC0831.
Thanks,
Cenlasoft