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Category: Inside Circuits Views: 2778 Rank: 2 The circuit is a light switch who triggers when light drops on photo resistor. It is fairly simple in construction and can be used in a million applications. The photoresistor and the trimmer work as a voltage divider and also polarize the transistor TR1. TR1 triggers TR2 and TR2 drives the relay. Trimmer R7 is for adjusting the sensitivity of the circuit.  Parts: R = photoresistor R1= 4.7 Kohm R2= 1.2 Kohm R3= 2.2 Kohm R4= 1.2 Kohm R5= 1.2 Kohm R6= 2.7 Kohm R7= 100Kohm Trimmer C1 = 10uf/16V electrolytic TR1= BC107 - BC108 NPN TR2= BC107 - BC108 NPN TR3= BC557 - BC558 PNP - BC327 D1 = 1N4148 Relay = any 12Volt relay Datasheet file1: Click here to download BC107.pdf datasheet. Datasheet file2: Click here to download BC557.pdf datasheet.
Related circuits A relaxation oscillator is used to flash an LED in the base circuit. Cl is charged slowly through R1 by the power source, then discharged periodically through R3 and the LED by the UJT. Telephone handset tone dial encoder This encoder uses a single contact per key keyboard and provides all other switching function electronically. The diode between terminals 8 and 15 prevents the output going more than 1 volt negative with respect to the negative supply V- Colpitts 1 To 20Mhz Crystal Oscillator This is a simpie Colpitis crystal oscillator for 1 to 20 MHz, can be easily made from junk-box part A positive transient, such as the power switch closing, charges r through L to a voltage above the supply voltage, if Q is sufficient. When the current reverses, the diode blocks and triggers the SCS. As the capacitor discharges, the anode gate approaches ground potential, depriving the... The XR-T5995 Speech Network is a monolithic integrated circuit specifically designed for implementing a low cost telephone circuit. This proportional control crystal oven heater uses lead/lag compensation for fast setting. The time constant is changed with R4 and compensating resistor R5 The input signal is applied through R3 to the inverting input of the summing amplifier and the output is taken from the first integrator. The summing amplifier will maintain equal voltage at the inverting and non-inverting inputs. Defining 1/R1C1 as 1 and 1/R2C2 as u>2> th^ is now a convenient... Digital Miscellaneous Temperature Gauge A diode (IN4148) is used as a temperature sensor. IC2 is an A/D converter with BCD output. A refere wireless light switch on - off 150 meter ??????????
Simple Electronic Breadboard Circuit
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