At 09:14 AM 5/12/99 -0700, you wrote: >Friends, >I have a project where I need to read an analog voltage of >+7V-+18V. It is an internal power monitor of a RF amplifier. >I am using it in a test fixture and was hoping of some way >to read the voltage to know how many watts are at the >output of the amp, without using a power meter. >Does anybody know of an A/D converter that >goes that high? Does the PICs internal A/D go that high? >Any ideas?? Thanks in advance............................. Easy. Pick an ADC--any ADC. Put a resistor divider network in front of the ADC. Signal in one end, other to ground, divided output from the middle to the input of the ADC. e.g. 10 volt signal into two 100K Ohm resistors, with one end tied to signal ground, will give 5 volts out the center. Simple OHMS LAW stuff. Remember that the divider network takes current, so keep your resistors as high as possible, add buffer amps as needed if driving a low impedance input, etc. **************************************************************************** ******** All legitimate attachments to this email will be clearly identified in the text. Please note our new address and phone numbers. William K. Borsum, P.E. DASCOR P.O.Box 462885 Escondido, CA 92046-2885 V&M&F) 760-796-7785 Direct) 760-796-7788