Use SGZ to make light-controlled automatic flashing lights

There are two oscillators inside SG207 f. With f2, pins 3, 4 and 5, 6 are the external oscillation capacitor terminals of the two oscillators respectively.
The current circuit has capacitor Cl connected to pins 3 and 4. Therefore, the oscillator f. The starting
oscillator can output a square wave pulse signal, and the oscillator will not be used if it is left empty. Pins l and
2 are two mutually inverted control input terminals of the oscillator. They are connected to the positive terminal
of the power supply through the photoresistor RG and the potentiometer RP respectively .
The condition for the oscillator to start vibrating is that the potential of pin 2 must be greater than 0.7V relative to pin 8.
Therefore, when the resistance value of RP connected to pin 2
must be greater than a certain value, and the resistance value of RG connected to pin l must be greater than a certain value, the oscillator fl will
start to vibrate. Only the speaker and flash terminals have output. IO, Il, and
pins 12 and 13 are the speaker and LED output terminals respectively. Each of them has a power
amplifier transistor. Since the SG207 speaker output current can reach 50-100
mA, the relay K is connected between the +12V power supply and pin 11. time,
and connect pin 10 to the ground, the speaker output current is enough to drive a small
electromagnetic relay to act on the suction table. Flash output pins 12 and 13 are
left empty.
    When night comes, the light shining on RG weakens, causing the potential of pin 2 to rise. When the potential is greater than 0.7V, fi starts to
oscillate and outputs a pulse signal. After being amplified by the internal amplifier and driven by the power amplifier tube, the relay K connects to the gap suction table and Release, its normally
open contact kl will intermittently connect the power supply of the electric lamp H, causing the lamp H- to shine in a flash. Increasing or decreasing the capacity of the capacitor cl can change
the frequency of the oscillator f, so the flashing frequency of the lamp H can be adjusted. If the CI capacity is large, the flickering frequency is low; if the CI capacity is small,
the flickering frequency is high.
    The power supply voltage VDD of the S0207 integrated circuit can be selected between 3 and 5V. This machine uses VD3, Rl and C2 to
provide a simple voltage regulator to stabilize the voltage of pin 14 at around 3.6 V to ensure reliable and normal operation of the integrated block.