----- Original Message ----- From: Bruno L. Albrecht To: Microcontroller discussion list - Public. Sent: Thursday, May 28, 2009 7:34 AM Subject: Re: [EE] frequency to voltage converter (FVC) This is actually part of a speed controlled motor controller. Know what I mean? I have to control the motor's voltage in order to keep its speed constant. This means I'll have to compare the speed with some reference and then raise or lower the motor's voltage to keep its speed as I want (probably this reference will be adjustable). I should do all this only with opamps, resistors, capacitors, etc. By black boxes, I meant I can't use Frequency-to-Voltage ICs, I should do one myself. And can't use any "digital devices", such as a microcontroller, or a A/D converter... Cheers, Bruno Homework problem, lab project? * | __O Thomas C. Sefranek tcs@cmcorp.com |_-\<,_ Amateur Radio Operator: WA1RHP (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz ARRL Instructor, Technical Specialist, VE Contact. http://hamradio.cmcorp.com/inventory/Inventory.html http://www.harvardrepeater.org -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist