>I only used the 1uf to 1mf as an example. I want to measure a broad >range of capacitors, but I only need to know the approximate value >rather than the exact value down to the nth picofarad. Why not check out Electronics Now issure June 1996. It has a simple PIC based LC meter that has the virtue of being 'self calibrating'. The oscillator is based upon a LM311 comparitor - it looks simple and reliable. The PIC reads the frequency (or period - I can't remember), scales it, and sends it to an LCD display. It sounds like a great start for you if you still want to roll your own version. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (403) 489-3199 voice (403) 487-6397 fax Celebrating 15 years of Engineering Innovation (1984 - 1999) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. My posting messages to Usenet neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email.