with the transistor, thermistor and capacitor, can you show me how to make a circuit which:
a) turn on an alarm when the temperature is reached to 40 *C
b) turn one alarm 9 seconds after the contact is activated.

Thanks

Hi,
I have spent a long time researching up about using multi-channel radio control equipment (specifically aircraft RC systems as they have a large range of channels) and interfacing it with motors and other devices well outside their capable operating range. There are a few things I would like to know about how they can be integrated. One of the most annoying things about aircraft RC systems are the much lower voltage used on the reciever end (4.8V – 6V) compared to RC cars (6V-12V).
I first realised that this was not as simple as I once thought when I was given 3-channel RC helicopter transmitter and reciever and in the hope of wiring the RX outputs to transistors and being able to drive my higher voltage, high power motors. However this miserably failed when I realised that the reciever output was pulse width modulated so there was no linear voltage relationship I could use to drive a transistor with a variable voltage level across the base. I have looked around at frequency to voltage converting circuits and the like but I have not found any practical ones I can build with what I have. I remember hearing somewhere an RC filter can be used but has a comparably slow response time to frequency changes.

Here are the questions:

1) In most aircraft/helicopter RC systems, there are toggle switches on the controller. Do they just change the reciever output on and off?

2) What is the simplest, most effective way of converting a PWM/frequency modulated signal into a linear voltage ranging from 0V to supply voltage (depending on pot position)?

3) How do people build these high power remote control machines/robots in terms of the transmitter & reciever (converting the PWM signal into a linear voltage or some other method)? What type of high-power switching system is used to isolate the reciever circuit from the high-power circuit? (Transistors, relays etc…)

4) Where can I find an example of how an electronic system is integrated for use with radio control equipment? (Something like a control circuit for a robot from battlebots or robot wars)

Would be grateful for any helpful information,
Thanks.

Hi,
I have spent a long time researching up about using multi-channel radio control equipment (specifically aircraft RC systems as they have a large range of channels) and interfacing it with motors and other devices well outside their capable operating range. There are a few things I would like to know about how they can be integrated. One of the most annoying things about aircraft RC systems are the much lower voltage used on the reciever end (4.8V – 6V) compared to RC cars (6V-12V).
I first realised that this was not as simple as I once thought when I was given 3-channel RC helicopter transmitter and reciever and in the hope of wiring the RX outputs to transistors and being able to drive my higher voltage, high power motors. However this miserably failed when I realised that the reciever output was pulse width modulated so there was no linear voltage relationship I could use to drive a transistor with a variable voltage level across the base. I have looked around at frequency to voltage converting circuits and the like but I have not found any practical ones I can build with what I have. I remember hearing somewhere an RC filter can be used but has a comparably slow response time to frequency changes.

Here are the questions:

1) In most aircraft/helicopter RC systems, there are toggle switches on the controller. Do they just change the reciever output on and off?

2) What is the simplest, most effective way of converting a PWM/frequency modulated signal into a linear voltage ranging from 0V to supply voltage (depending on pot position)?

3) How do people build these high power remote control machines/robots in terms of the transmitter & reciever (converting the PWM signal into a linear voltage or some other method)? What type of high-power switching system is used to isolate the reciever circuit from the high-power circuit? (Transistors, relays etc…)

4) Where can I find an example of how an electronic system is integrated for use with radio control equipment? (Something like a control circuit for a robot from battlebots or robot wars)

Would be grateful for any helpful information,
Thanks.

Ok so a friend and I are having a disagreement.. He says a "switcher" opens and closes circuits, while I think its a transistor.

heres a copy of the question. A(n)____, Which is contained on an integrated circuit, can act as an electronic switch that opens or closes the circuit for electrical charges..

Also might be a capacitor..

Hi everyone, I am interested in learning how to build electronic devices such as radio controlled cars, flashing lights, anything. I would like it if anyone could post good books, tuts, online lessons, and dvds.
I want stuff that starts from the very beginning that teaches how capacitors, transistor, Integrated circuits, micro-controllers, anything of the sort, works. I know nothing about electronics and would like to learn thanks.

In a electronic counter there are relay output points and transistor output points. How these transistor output points can be used in a control circuit. Please give me the wiring details.

OK, so some people just said that foreigners think Americans are dumb.

Let’s see — maybe 90% of the technological advances in the last 125 years, most new medications, the lion’s share of Nobel prizes. The telegraph, the telephone, the phonograph, the electric light, the airplane, the digital computer, electronic television, color television, the transistor, the integrated circuit, the microprocessor, the Internet, yada yada yada . . . not to mention that we’re the richest and most powerful country in the world, landed men on the moon, have the highest percentage of college graduates of any nation, and almost all of the world’s top research universities.

OK, so am I missing something here?

1. When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,

A. the resistance will increase.
B. the current will increase.

C. the resistance will decrease.

D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?

A. Telephone services
B. The Internet

C. Newspaper publishing

D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical

A. conductors.
B. batteries.

C. insulators.

D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called

A. a signal generator.
B. a power supply.

C. an oscilloscope.

D. a multimeter.

FIGURE A-1—Use this illustration to answer Question 5.

5. Look at the four schematic symbols shown in Figure A-1. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?

A. Symbol 1 represents a diode, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a transistor.
B. Symbol 1 represents a diode, symbol 2 represents an LED, symbol 3 represents a transistor, and symbol 4 represents a resistor.

C. Symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a diode.

D. Symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an LED.

6. Which of the following is a correct definition of the term rectification?

A. Rectification is the opposition to current flow in a circuit.
B. Rectification involves sensing an electrical quantity and converting it to a signal.

C. Rectification is the conversion of AC current to DC current.

D. Rectification refers to the connection of components into a circuit.

FIGURE A-2—Use this illustration to answer
Questions 7–10.

7. Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

8. In the circuit shown in Figure A-2, what will happen when switches S1 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

9. In the circuit shown in Figure A-2, what will happen when switches S2 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

10. In the circuit shown in Figure A-2, which switches must be closed in order for the light bulb to light up?

A. Only switch S1 needs to be closed in order for the light bulb to light up.
B. Only switches S1 and S2 need to be closed in order for the light bulb to light up.

C. Only switches S1 and S3 need to be closed in order for the light bulb to light up.

D. Only switches S2 and S3 need to be closed in order for the light bulb to light up.

11. At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have

A. membership in several professional organizations.
B. certification as an electronics technician.

C. experience with on-line research.

D. your own test equipment.

12. Which one of the following letters is used as an abbreviation when representing a unit of electric current?

A. E
B. R

C. C

D. A

FIGURE A-3—Use this illustration to answer Question 13.

13. Safety is a concern around electronic equipment of all types. When you see the sign and the symbol shown in Figure A-3, what particular safety hazard may exist?

A. High voltage
B. Laser light

C. Delicate equipment

D. Radioactivity

14. Which of the following statements about light-emitting diodes is correct?

A. Light-emitting diodes conduct current in either direction in circuits.
B. Light-emitting diodes are used as indicators in circuits.

C. Light-emitting diodes have very short life-spans in circuits.

D. Light-emitting diodes are used

I have a physics assignment where I need to find a simple electronic car circuit and make a simple electric circuit that has the same function the electronic circuit has.

Now i'm pretty much stumped on this cause we've only been taught the basics like Ohms law and Kirchhoff's laws and i'll stuck.

Now here's the circuit I chose:

http://www.elecfree.com/electronic/power-flasher-with-mosfet/

Whoever creates an electric circuit that has the same function as that or helps me turn that into an electric circuit will get 10+ Points.

btw I understand the theory behind it I just don't really understand what you'd replace a transistor with in an electric circuit.

Also by Electric I mean a non-electronic circuit.

wen i fit in a 20A fuse to my amplifier,it jus blow up my fuse…….where could the problem cum from……..if is the transistor in the apm….where should i start……i have sum basic in electronic……i can read circuit diagram…..pls explain in detail…thank you…..