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#OXYGEN EMITTER DRIVER CONTROLLER ELECTRONIC CIRCUIT HOW TO#
#OXYGEN EMITTER DRIVER CONTROLLER ELECTRONIC CIRCUIT SERIES#

At 14 September 2012, 5:47:01 user John wrote: Ĭan you please tell me what type of transistors you use for the RS Flip Flop (RSFF).

At 16 September 2012, 15:20:37 user Giorgos Lazaridis wrote: [reply Giorgos they are 2n2222 but other simple npn transistor should work also.

When pressed again should provie an ouput to "2" for a small time period. Then pressed once, provides output to "1" for a small time period (1 sec). When power is applied the default state should be everything unlatched. I need a latch or flip flop circuit with one push button, but two outputs (bit like your monostable). Sir how this formula is formed "RB = 0.2 X RL X hFE"

At 28 April 2014, 13:27:46 user JUSTIN C DAS wrote:.

At, 7:35:45 user Giorgos Lazaridis wrote: [reply Giorgos C DAS Ok you start with the formula.

At, 8:49:38 user JUSTIN C DAS wrote: [reply JUSTIN C Lazaridis.

I can only see the resistor values for the input on the monostable.I am going to use 10K from another monostable circuit I looked up.Shouldn't that work.Thanks But if you have questions please use the forum instead to post it.

Dr.Calculus: Checking transistor functionalityīEFORE you post a comment:You are welcome to comment for corrections and suggestions on this page.

The SCR (Silicon Control Rectifiers) theory.

#OXYGEN EMITTER DRIVER CONTROLLER ELECTRONIC CIRCUIT HOW TO#

How to make a light / dark activated switch - 3 different circuits under the microscope.The timing chart for this circuit is shown below: The two inputs works as set and reset, and the outputs work as Q and -Q. This circuit will act exactly as an RS flip flop. In this case, you should use a second transistor connected as a driver.

In this case, there is danger overheating the transistor if you have big loads like lamps and motors. There is a point that the transistor will not be either on or off. You should consider using low current loads using this circuit. This R P should be from 1Kohm to 22Kohms. This resistor is used to protect the transistor when the potentiometer is switched to low values. Also note the resistor on the left circuit labeled R P. You should consider using a potentiometer 10Kohms. The potentiometer R S will control the sensitivity of the automation. The left circuit will switch on the load when the LDR is in dark, and the right will switch on the load when light fall on the LDR. The LDR is a resistor that will change it's resistance according to the light falling on the sensor. You choose the closest resistor possible to this value.īasic transistor relay driver, actuated on LOW input (PNP)Ī transistor may be connected in a way that will switch on and off a load (R L) according to a sensor. With the use of some basic maths, this will produce R B = 2666.6 Ohm. Because the power supplies of transistor and I C are different, we use the second formula: So we choose a transistor with h FE = 200 and IC = 100mA. The transistor must have an h FE greater than 5 X 75 / 2 => h FE > 187.5. The IC can supply a maximum current of 2mA. The supply voltage is 12V for the transistor and 5V for the IC.

#OXYGEN EMITTER DRIVER CONTROLLER ELECTRONIC CIRCUIT SERIES#

The output from a 74LS series TTL IC is required to operate a relay with a 160 Ohm coil. The protective diode could be the 1N4001 or any general purpose diode. Otherwise, if the component uses another power source (like V CC) then the form is: Then you calculate the base resistor R B, If the input is taken from a component (possible an IC) that uses the same power supply as the transistor (that is Vs), then the form is: You must select it according to it's Ic that must be greater than I L and it's current gain h FE. It must be at least 5 times the load current IL divided by the maximum output current from the Input to the base of the transistor The values for Rb and Qs vary accordingly. The protection diode Dp is used to protect the transistor from the reverse current generated from the coil of the relay during the switch off time. The relay will be actuated when the input of the circuit goes high. It is used to switch high loads or loads that needs AC current to operate. This circuit will drive a relay coil from a low power output, usually from an IC like 555 or a TTL/CMOS.