Resistor quickly Estimating schematic with 555

Published:2013/1/23 2:17:00 Author:Ecco | Keyword: Resistor , quickly Estimating, 555 | From:SeekIC

The core of circuit is a multivibrator composed of 555 and R1, R2, R3, Rx ( measured resistor ), C1, etc. The resistors R4 ~ R9 in circuit are the Estimating known resistors. The multivibrator output signals' period is T = 0.693 [ R1 +2 ( R2 + R3Rx / ( R3 + Rx ) ) ]. You can change the oscillation frequency by strobe switch K position, then the speaker issues different tone signals.



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