Tuesday, April 12, 2011
220VAC Motor Speed Controller Circuit With Triac
This 220VAC motor speed controller Circuit can handle brushed AC motors and other loads up to about 250W.It works the same was a dimmer circuit, cutting a portion of the AC waveform is seeking to effectively control the tension. Because of this feature will work cycle for a wide variety of loads including incandescent bulbs, heaters, brushed AC motors and transformers. The circuit attempts to maintain a constant engine speed regardless of load, it is also ideal for power tools. Note that the circuit can only control brushed AC motors. Inductive motors require a variable frequency control.
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| 220VAC Motor Speed Controller Circuit With Triac |
Note:
List Component- TR1 must be chosen to match the requirements of the load. Most generic TRIACs with ratings to support your load will work fine in this circuit.
- U1 must be chosen to match the ratings of TR1. Most generic DIAC based opto-isolators will work fine
- T1 is any small transformer with a 1:10 turns ratio. The circuit is designed to run on 120V so a 120V to 12V transformer will work. Alternately, you can wind T1 on a transformer core using a primary of 25 turns, a secondary of 200 turns, and 26 gauge magnet wire.
- R9 is used to adjust motor speed. R10 is a trim pot used to fine tune the governing action of the circuit. R8 fine tunes the feedback circuit to adjust for proper voltage at the gate of SCR1. It should be adjusted to just past the minimum point at which the circuit begins to operate.
- R13 must be chosen to match the load. Generally, larger loads will require a smaller value.
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 1/4W Resistor
R8 : 3K Trim Pot
R9 : 5K Taper Pot
R10 : 4.7K Trim Pot
R11 : 3.3K 1/4W Resistor
R12 : 100 Ohm 1/4W Resistor
R13 : 47 Ohm 1W Resistor (See Notes)
C1,C3 : 0.1uF Ceramic Capacitor
C2 : 100uF/50V
D1 : 6V Zener Diode
Q1 : 2N2222
SCR1 : ECG5400
TR1 : TRIAC (See Notes)
U1 : DIAC Opto-Isolator (See Notes)
BR1,BR2 : 5A Bridge Rectifier
T1 : Transformer (See Notes)
Automatic 12V Car Battery Charger Circuit
This car battery charger circuit is drawn to charge 12V batteries ONLY. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage.
The red LED will turn on, when charging is complete and charging circuit will deactivated. This circuit used only for 12 V battery. When wiring up the circuit, Certain emphasis should be taken. They are hose supplying current to the battery being charged and the connections of the transformer to the circuit board. To prevent heat build-up and voltage-drop when current flows through the circuit, the connections of the transformer to the circuit board should be made with cables having a large cross-sectional area
List Component:
R1= 1Kohms D1 = 1N4001 T1 = 15V/5A Transformer
R2= 1.2Kohms D2 = 6.8V 0.5W zener LD1= Green LED
R3= 470 ohms TR1= 4.7Kohms trimmer LD2= Red LED
R4= 470 ohms Q1 = BTY79/similar 6A SCR M1 = 5A DC Ampere meter
R5= 10K ohms Q2 = C106D SCR S1 = On-Off Switch
C1= 10uF/25V GR1= 6A Bridge Rectifier F = 5A Fuse
Overvoltage Protector Circuit for 12VDC
A 12VDC overvoltage protector circuit is shown in the schematic diagram below. This circuit will work to disconnect the protected device from the power supply when an overvoltage occurs at the supply. This circuit uses a silicon-controlled rectifier (SCR) and normally-closed 12-V relay, K1. The silicon-controlled rectifier is connected in parallel to 12-V line to monitor for the overvoltage condition. This applied signal is sensed by the SCR’s gate.
Until the voltage drops below the set value, the K1′s contacts remain closed and SCR1 remains off. The SCR1 will be triggered causing K1′s contacts open and halt current flow to the loas when overvoltage occurs. You can use R1 to set the trigger point of SCR1
Until the voltage drops below the set value, the K1′s contacts remain closed and SCR1 remains off. The SCR1 will be triggered causing K1′s contacts open and halt current flow to the loas when overvoltage occurs. You can use R1 to set the trigger point of SCR1
Tuesday, April 5, 2011
TL497A Simple Voltage Converter Circuit
This voltage converter circuit is built with TL497A and converts an input voltage of 5 to 12 voltage to a higher level of 15 - 30 volts. This is specially helpfull in mobile applications where power supply levels are commonly limited to 12 volts supplied by batteries.
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| TL497A Simple Voltage Converter Circuit |
Sunday, April 3, 2011
20A Variable Power Supplay Circuit Based L200 IC
This Power Supplay circuit is constructed for the use with 100Watt transceivers. When you build the unit you should care for a good kooling of the finals. The next thing is to provide at least 2500uF pro Ampere you want to pull out of it. You can get more current out of the circuit by adding more final transistors to it. Except of the emitter resistors all of the other ones are for 0,5 Watts typs.
20A Variable Power Supplay CircuitThe L200 is abel of regulating the voltage as well as the current. The TAG 226 and the zener-diode are there to protect the attached equipment against overvoltage. The power-supply is adjusted to run at 13.8V and the zener-diode is a 14V type, so as soon as the voltage gets to 14V the thyristor will be switched and produces a shortcut, and blows the 20A fuse. To use the circuit with this handbrake at higher voltages you should replace ZD14 against a higher one. Or make an adjustible krowbar that runs simultanuesly with the voltage
This power Supplay Circuit From http://www.mydarc.de/dl5dbm/20a_e.pdf
This power Supplay Circuit From http://www.mydarc.de/dl5dbm/20a_e.pdf
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