Jordan Dimitrov is an electrical engineer in measurement and instrumentation at Tradeport Electronics, Vaughan, Canada. He received a BSc, MSc, and PhD from the Technical University, Sofia, Bulgaria. Email address: jodimdim@yahoo.com
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September 13, 2007[Ideas For Design] Adjust 555-Based Generator's Duty Cycle Without Affecting Frequency
A free-running generator built on the standard configuration of the 555 timer can't provide a duty cycle of exactly 50%. That's a well-known fact. Fortunately, there are several ways to get around this problem. The best is to place an extra resistor, R3, between the two regular resistors, R1 and R2, and the chip's discharge pin (Fig. 1). The problem is that variations in R3 strongly affect output frequency (...
