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SCR UYGULAMA ORNEKLERİ Dimer devreleri Şekil 2.115.h) U 217 B ile 5 ila 30 C arasında ortam ısı Şekil 2.115.i)TCA 785 tetikleme entegresiyle triyak yük denetimi Tetikleme açısı 0 ile 180 arasında ayarlanabilir. (+) yarı peryotta 15’den, (-) yarı peryotta 14 ten 100 s’lik birer pozitif darbe uygulanarak denetim yapılır. Şekil 2.115.j) TCA 786 ile ters paralel bağlı iki tristörlü AA kıyıcısı devre denetimi Electronic flykilling device principle diagram Published:2011-9-1 1:21:00 Author:Ecco | Keyword: Electronic flykilling device (View) Bathroom Fan control Published:2012-10-10 1:55:00 Author:muriel | Keyword: Auto, Bathroom Fan This auto bathroom fan control circuit design is a lamp and fan motor control with a delayed switch off. This automatic fan control is commonly used in toilet and bathrooms. When switch S1 is closed, the fan motor and the lamp turns on. When switch S1 is opened (switched off), the lamp goes out but the fan motor will keep running for another 3, 6 or 1 minutes linger (set by S2). This delayed switching off of the fan ensures that the unwanted odor is really fanned out the toilet.The heart of the bathroom exhaust fan circuit is the SAB0529 IC. It is a programmable extended time timer brought to the market by Siemens. This IC can be programmed to time from 1 second up to 31.5 hours. This extended time capacity is achieved by the IC by using the power line frequency as its time base. The bathroom fan light control circuit is commonly used to control inductive loads such as the case of fan motor. For this reason, a current synchronization is necessary. This is done with resistor R6. In addition, a capacitor C2 is connected between pins 15 and 1. This capacitor sets the pulse length at the output pin 16. If one decides to use a different triac, one needs to change the value of R5 . THis resistor sets the level of the trigger current, in this case 5 mA. The syc resistor R6 must be changed also. If the triac power and holding current (Ih) are known, one can get the value of R6 from the table below: bathroom fan controller circuit diagram (View) 800_W_soft_start_light_dimmer Published:2009-7-22 3:35:00 Author:Jessie This circuit shows the basic UJT building block (Fig. 9-1), which is used in a light dimmer with soft-start operation that applies current to the light slowly enough to eliminate high surges (high inrush current). These current surges, found in most cold-filament light dimmers, shorten lamp life. With this circuit, the lamp is heated slowly by a gradually increasing voltage so that inrush current is kept to a minimum. R4 controls the charging rate of C2 and provides the means to control or dim the lamp. (View) Low_voltage_lamp_flasher_that_uses_a_PUT Published:2009-7-22 3:59:00 Author:Jessie This circuit shows a PUT used as a lamp flasher, where the supply is only 3 V. Q1, R1, and C1 form a relaxation oscillator. Q2 and Q3 form an SCR flip-flop. Notice that C4 is not a polarized capacitor. For the values shown, the lamp is on and off for about 0.5 s each. (View) One kind of electron ballast circuit principle diagram Published:2011-4-20 6:30:00 Author:May | Keyword: electron ballast (View) Sanhe Songshi 15W vibrating massage stick circuit Published:2011-4-18 2:58:00 Author:Ecco | Keyword: Sanhe , Songshi , 15W , vibrating, massage stick PWM motor speed control circuit Published:2011-3-22 3:16:00 Author:may | Keyword: PWM motor speed control diagram: PWM motor speed control circuit (View) http://booklens.com/g-k-dubey/thyristorised-power-controllers 3.5 Ac speed motor controller Figure 1: ac speed motor controller 3.5.1Principle of work This AC motor speed controller can handle most universal type (brushed) AC motors and other loads up to about 250W. It works in much the same was a light dimmer circuit; by chopping part of the AC waveform off to effectively control voltage. Because of this functionality, the circuit will work for a wide variety of loads including incandescent light bulbs, heating elements, brushed AC motors and some transformers. The circuit tries to maintain a constant motor speed regardless of load so it is also ideal for power tools. Note that the circuit can only control brushed AC motors. Inductive motors require a variable frequency control. Parts list: R1 27K 1W Resistor R2 10K 1/4W Resistor R3 100K 1/4W Resistor R4 33K 1/4W Resistor R5 2.2K 1/4W Resistor R6 1K 1/4W Resistor R7 60K Ohm 1/4W Resistor R8 3K Linear Taper Trim Pot R9 5K Linear Taper Pot R10 4.7K Linear Taper Trim Pot R11 3.3K 1/4W Resistor R12 100 Ohm 1/4W Resistor R13 47 Ohm 1W Resistor C1, C3 0.1uF Ceramic Disc Capacitor C2 100uF 50V Electrolytic Capacitor D1 6V Zener Diode Q1 2N2222 NPN Transistor SCR1 2n65041 TR1 TRIAC (See Notes) U1 DIAC Opto-Isolator BR1, BR2 5A 50V Bridge Rectifier T1 1 Transformer See appendix for datasheet