This circuit uses for control to load with SCR by take a signal from a Output of IC LM556 and NE555. For Load that use have varied such as mini motor,Lamp, Fan etc. S1 use for reset circuit.
Source 555-556 SCR Output By IC Dual Timer 556
Interval Timer By IC Dual Timer 556
The Timer 1 wasp be Oscillator Circuit. Next part Timer2 be the Relay drives Circuit model to delay. By timer1 encourage Timer2 intermittently and timer2 as a result drive oval 3-5S long ago use. Relay 6V and Volt supply 9V part R1 fine frequency value of Timer1.
Source : Interval [...]
Circuit Programmable 4-State Tone Generator By IC Dual Timer 556
Change the value C1 and C4 for change the sound.
fix give
L = GND
H = +5V to +15V (VDD)
Mode Select
B A output
L L Two-Tone
L H Steady
H L Burst
H H Metronone
See the detail adds in circuit picture.
Source : Programmable 4-State Tone Generator By IC Dual Timer 556
Other Link
555-556 [...]
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