Microwave turn-off delay device

Published:2011/8/14 22:52:00 Author:Ecco | Keyword: Microwave , turn-off delay device | From:SeekIC

The microwave delay-off circuit is composed of the power supply circuit and delay control circuit, and it is shown in Figure 3-209. Power supply circuit consists of the nonstick button switch Sa, step-down capacitor Cl, resistor Rl, rectifier diodes VDl-VD4, voltage regulator diode VS and filter capacitor C2. Delay control circuit consists of op-amp integrated circuit IC, transistor V, relay K, delay capacitor C4, button switch Sb, current transformer TA, diodes VD5-VD7, resistor R7 and other components. Rl selects the 1/2W carbon film resistors; R2-R7 use the l/8W or 1/4W carbon film resistors.



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