Op amp F003 composition of automatic exposure timer circuit

Posted on Mar 28, 2007

As shown in Figure II F003 is versatile photographic constituent operational amplifier amplifying automatic timer circuit. Operational amplifier A1 composition integrator

Op amp F003 composition of automatic exposure timer circuit
Click here to download the full size of the above Circuit.

operational amplifier A2 composed of comparators. 2CR silicon photocell voltage is generated by the integrator input signal V1, the signal input from the pin , Al output voltage with the reference voltage to the comparator comparison. When the output voltage is equal to the upper limit threshold voltage comparator Ems, A2 comparator output is high, the transistor VT conduction, relay, lamp, and the end of exposure, exposure time so as to achieve automatic control purposes. Ems by a 10k potentiometer setting, the exposure time T = R1C1Ems / V1. S switch to automatic, manual switch. AN integrator reset button for the switch.

Leave Comment

characters left:

New Circuits



Popular Circuits

76MHz to 119MHz Fm transmitter
Z80 clock circuit
Push-on-push-off electronic switch
Two-Position Dimmer
control interface via pc keyboard
Music Equalizer Display Circuit
Emitter negative feedback differential amplifier gain control circuit
Practical digital amplifier TL084