A radio antenna is connected to an electronic circuit that oscillates 100 million times per second. What is the wavelength of the radiation emitted by the antenna? How would i work this problem out? thanks

How can i design a circuit (for example in a simple electronic home safe) that is open, and only closes if there are three failed attempts. thank you.

I WOULD LIKE TO KNOW HOW TO REMOVE GOLD PLATING FROM COMPUTER COMPONENTS & ELECTRONIC CIRCUIT BOARDS. WHERE CAN I FIND A DIAGRAM/SCHEMATICS ON BUILDING A GOLD RECOVERY UNIT.
THANKS IN ADVANCE!

the machine is just out of gaurantee.it looks like the circuit board has blown.
is it expensive and where would i get one?

Hifonics BXi606 1-Channel Car Audio Amplifier
Monoblock Class A/B Amplifier with Bass Level Control
RMS Power Ratings:
1 ohm: 600 watts x 1 channel
2 ohms: 300 watts x 1 channel
4 ohms: 150 watts x 1 channel
Hifonics New Illuminated Heat-Sink Design With Blue LED Light Pumps
Hifonics Blue Illuminated Logo
Maxxsonics Illuminated "M" End Panel Logo
Heavy-Duty Ultra-Fi" MOSFETS
Highly Efficient Super D-Class Amplifier Circuitry With Oversized MOSFET Output
Fully Adjustable Accu-Cross" Crossovers
±18dB Variable Bass Equalization @ 45Hz
180° Variable Phase Control (15 to 35Hz)
Dash-Mountable Bass Remote Control Included
Variable 24dB Subsonic Filter
Brutus Pulse Wave Modulated MOSFET EXVP (Exponential Vari-Power Supply)
Twin-Turbo Torroid Coil Design
HSMD Hifonics Surface Mount Design
Balance Line Inputs for our 18-Volt Line Drivers
RCA Line Output for Amplifier Daisy Chaining
Gold 4-Gauge Power Connectors
Dimensions: 9.84"L x 10.39"W x 2.63"H
1-year Techronics.com warranty
MTX Audio TA2301 Thunder 2301
300W RMS, Class D Monoblock Amplifier Thunder2301 Product DescriptionThunder TA Series Class D Monoblock Car Amplifier
RMS Power Rating:
4 ohms: 150 watts x 1 chan.
2 ohms: 300 watts x 1 chan.
Max power output: 300 watts x 1 chan.
MOSFET power supply
Wired remote bass level control included
Thermal and short LED indicators
Tuned Bass EQ (0-12 dB bass boost at 40 Hz)
Adaptive Class D Technology: With MTX innovative approach, the amplifier’s switching energy is constantly changing and is moved away from FM radio frequency ranges as the amplifier’s load and output increases.
Thermal and short protection
StreetWires Connectors
Xtant Technologies Cooling (XTC) thermal-regulated, turbo-charged intercooler
Variable low-pass filter (at 80 or 120 Hz, 24 dB/octave)
CEA-2006 compliant amplifier
Dimensions: 12-11/16"L x 9-5/8"W x 2-1/2"H
4 or 8-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
1-year Sonic Electronix warranty
Amplifier Specifications:

Amplifier Class D
Number of Channels 1 – Mono
RMS Power (4 ohms) 150 watts x 1 channel
RMS Power (2 ohms) 300 watts x 1 channel
RMS Power (1 ohm) Not Stable
Bridged RMS Power N/A
Peak Power Output N/A
Minimum Impedance Unbridged 2 ohms
Minimum Impedance Bridged Not Bridgeable ohms
THD at Rated RMS Power .5%
Speaker Level Inputs No
Preamp Outputs Yes – 1 pair
Built-in Crossover Low-pass (LP)
High-Pass Crossover Frequency N/A
Low-Pass Crossover Frequency 80
Subsonic Filter N/A
Signal-to-Noise Ratio 73 dB
Channel Separation N/A
Bass Boost 0 – 12 dB
Bass/Gain Remote Yes
Fan Cooled Yes
Fuse Rating 20A x 2
2000W Pyle Dryver PLAD413 4 Ch High Power MOSFET AmpBrand New Pyle Dryver PLAD413 2000 Watt 4 Channel High Power MOSFET Amplifier
4x 200W RMS at 4 Ohms
4x 500W MAX at 4 Ohms
2x 800W MAX at 4 Ohms Bridged
4x 350W RMS at 2 Ohms
Electronic Crossover Network
Bass Boost Circuit
Bridgeable at 4 Ohms
2 Ohm Stereo Stable
Tri-Mode Capable
Gold Plated RCA Inputs
Line Outs for 1 and 2 Channel
Low Pass Filter Control
High Pass Filter Control
Remote Bass Level Control
Power and Protection LED Indicators
Red Lighting Illumination
Side Leg Mounting
THD: <0.04%.
S/N Ratio: >90dB
Input Sensitivity : 100mV ~4V
Channel Separation : >65dB
Freq. Response : 10Hz ~ 30KHz
Patent Pending
Soft Turn-on/Turn-off
Dimensions : 8.6''(W) x 2.74''(H) x 12.6''(L)
Item Manual: PLAD413 Click Here

does anybody know of a computer program that allows you to design an electronic circuit, and then run it so you can see how it reacts and works.

it has to be able to run on windows XP

I don't need it to do very complex circuits, as long as it has basic chips, like the 555 chip etc.

if it shows the flow of electricity though the circuit that would be great, even better if you can slow it down to watch the changes in flow

ideally want one that is free or very cheap

Hey, i am a fire alarm lover. My control panel is homeade using a 160 in one electronic kit. I have 1 bell and strobe, 3 pull boxes.

I have a latchning circuit created using a relay. But i want to create a delay circuit. (All pull boxes work with the latching circuit)

I have been told to use a 555 timer but at this time i dont have a breadboard or the timer. I herd i could use a capaciter and resister, but cant figure out how to wire it up.

I have capacicters, resisters, transisters, diodes etc.. all on the board (kit) i can use.

What i want is to have it so when any of the intiating devices are activated such as pull stations, it has a 1-3 second delay before the relay actives and then activates the alarm.

Anybody that knows how to help me would be greatly appreciated.

Thanks so much, Chris.

I have recently started electronics and have bought a breadboard and soldering iron. What is a store where I can find most wires and components (I've tried radioshack no wire there). A real store please, not an online one. Also, what type of wire should I use for general circuits?

I’m trying to build my first electronic circuit, and I have a couple questions about it.

In this circuit:

http://img242.imageshack.us/my.php?image=fs9pv77fjd365×2mediumqa4.jpg

is the ground just a path back to the negative pole of the 9v battery? If so, does it matter the order in which I connect the grounds back to the negative pole? If not, what exactly is it?

My google research made it sound like people use the term ground ambiguously.

Thanks

http://www.electronics-lab.com/projects/science/019/Electronic_Stethoscope_2.jpg