I need to convert an ac signal to dc from 0.8v to 18v with 1.18mA current. can i do this with opamps without blowing up everything? i did it in TINA but i dont know in real life if anything blows up or if this is possible cuase i used 4 opamps to do that and everything was connected to ground to amplify to 18Vdc and i used a capacitor 47uF (connected parallel to + and ground just before the bridge rectifier i did with 4 1N4007 diodes) to make the current 1.18mA and according to TINA the ac temperature was 180c celsium. but if the signal 0.80vac gets smaller or higher i want the volts 18vdc to be stable 18Vdc .. i hope there is someone out there to help me.
An ordinary opamp can have its output as high as 31V and its output current as high as 5mA both at the same time. It would be easy for an opamp to amplify and rectify the signal into 18VDC at 1.18mA.
But you forgot to say what is the frequency of the signal which might be too high for an ordinary opamp and ordinary low frequency rectifiers.
Actually i don't know the signal frequency. the AC frequency here in Cyprus is 50Hz. is there any way to find out for sure?any tools like an Ammeter that shows the frequency?
Everybody should know the mains frequency in their country. I asked for the frequency because you did not say it was for the low mains frequency. It might have been a radio frequency or a microwave frequency.
An ordinary opamp and ordinary recifier diodes work fine at the low mains frequency.
0.6v~1.2vac 1.1uA~2.2uA to 18vdc 1.14mA?
Posted - Aug 23 2009 : 5:42:03 PM
