Mhz

Hello, I have the need to build a frquency Emmiter that will be Powerful enough to operate at about 100 feet distance, be able to have an adjustable frequency from about 1khz to 1Mghz... I would like to be able to input the desired frequency some way. Would I be better off buying such a gadget if available or attempting to assemble it a little at a time...? Thanks for any help

Hello, IMO it will probably be a bit cheaper and less time to buy one for about 10 or 15 bucks, But if you're doing it as a project or hobby, I would suggest getting your hands on a Voice Recordable Chip from Radio Shack or other Electronic Outlet, and then put together a simple schematic that will allow you to tie it into your phone system... I believe many of these type of chips allow for multiple recording points which will serve good for numerous messages.

Thanks Kevin and audioguru, very knowledgable answers with audioguru a bit easier for me to grasp, but none the less a very much thanks to your response Kevin, THANKS.

Thanks for the reply Prat.. Yeah, I have a power supply that appears to be putting out the correct voltage, but I'm uncertain of if the Rated Amperage Output is correct... It should be delivering 4 amps AC. But I'm not sure if it is. The device that it is powering is acting kind of whack at times, and now only a few leds show on it, It won't come on at all now, so I'm not sure if it is the device or the Supply... By the way the device is a Audio Mixer by Tascam.. Not supported anymore.. Anyhow thanks for the info... :)

Thanks Sasi for the Attempt to help, I believe it will be more difficult for me to Invert the DC to AC than buying or finding an AC source that will give me what I'm looking for... thanks anyhow..

ok Sasi, thanks for the help... Forget about my initial Voltages.. How do I convert DC Voltage to AC Voltage? Is there a Circuit That Show this type of Conversion? I will figure out the amperage breakdown using resistors after I get the dc source converted to AC.. The reason I'm asking this question is because I have a power source that Distributes 12v DC @ 5 amps, and the product I need to use it on need 10v AC @ 4 amps...

60hz ... it will be plugged in a standard house outlet..

Hello, Just wanted to know a good design (Circuit) to measure DC and AC Amperages without damaging the Power Supply being tested. Is there a Particular or certain LOAD to use when measuring the current? I know you are not suppose to measure direct current from a supply source without a load of some sort, this is why I ask what type of load source to use and the formula to calculate the current reading based on the Load used.. Thanks In Advance for any help here..

Hello Everyone, I'm Trying to find a good way or Schematic, that will show how to convert 12v DC (5 amps) to 10v AC (4 amps)... ??? Any solutions to this question will be much appreciated... Thanks

Hi, Yes, CMOS Comes in a variety of packages and functions for different purposes... CMOS type devices are known for there low power consuption for small devices etc. and are very sensitive to Static Electricity.. If you are somewhat familiar with TTL type components, then CMOS are somewhat comparable to your knowledge of TTL with the exception of adavantages of low power and other factors. If you are not Familiar with TTL design and operation, then you are puting the chariot before the horse and should first possibly get more knowledged on how these devices work, and then CMOS will be a bit more understanding to your project. There are plenty of References on these devices and their operations on this Forum's Links and the Internet Abroad, try that and I'll bet it will help your request on CMOS operations and functions... 8)

Great References Ante, Now I will have to somehow convert the actual Module unstable voltages and current into a definable output for the Circuits You Referenced me to, since they are sensitive digital type circuits... But This IS GREAT! :) Thanks Alot Once Again... 8)

Yes Ante, that's correct.. Just something to verify the Pulstrain of the Module, and preferably a circuit that will hold the data to show me that there is a Pulse comming from the Module.

by the way Ante, or any other helper, the circuit doesn't have to be a counter, but anything that will allow me to capture the results without me looking at it. That is why I suggested a Counter.. Sometimes it's hard to monitor the tester while cranking the engine etc...

Hello Ante, once again.. :) .. Yes, the circuit tester I am interested in designing will be used for checking Pulse-Type Voltage from an Automotive Ignition Control Module.. I do understand that it's easier to go buy one, but I want to design My own... My knowledge is that The Voltage that sends the Signal to the Coil Pack from the Module, is a Negative Voltage. I am designing this project to check for faulty Control modules (Pulsating or Not). As far as Amperage Draw, I belive for these 'Auto' devices, it should possibly be anywhere from 2 amps and up.. I'll have to measure and check.. Anyhow, thanks for the response and let me know of any help you can provide, thanks...

Hi, I'm Interested In designing a circuit that is capable of reading (Counting) voltage presence for a dc ground reference that will be shuting off and on... I dont believe the lowest point of voltage reference will fall to zero, but anywhere from 100 millivolts to 12v. any Reference or Ideas of such a circuit? Thanks for any help.

Hi Dazza, and thanks for the Response... Yeah, I am creating a little Project where I can Test Injector Pressure for leaks and Possible Spray Patterns. I need to get my hands on a New Injector to see the actual Spray Pattern Under Various Pressures. I've Chosen Line Type Power Supply due to the fact That I Really didn't want the Clumsiness Of having to handle a Large Battery and the Worrisum Problem of Keeping It Charged. I feel It's Much Easier To Plug In The Power and Start the Testing... My Idea Is to have all the Equipment on a Portable Board, Another Reason I would Like To Be Without the Large Battery. Thanks For The Interests, and let me know if you have anymore Suggestions, They are Welcome... :) PS. Believe it or Not Ante, I really thought about the 'SIR' before using it... I keep telling myself to follow that first thought.. :), Your Response Is Noted, No More SIR For you Young Man.. ;)

SUPER! :) YOU ARE VERY MUCH APPRECIATED SIR..THANKS ALOT! :D

:) :D Excellent Ante! .. I really Appreciate the Data... Don't want to sound like a super amature, but will I have to also look for a certain amperage on the Transformer's Output to achieve the 8 or more Amperage or just selecting the 120 - 150 Watt will be sufficient enough?

Thanks Alot Ante, and yes, Funny Line MP :) .... Yeah Ante, That is a Great Problem Solver for the Amperage Rating You have Given... Now I wonder will there be a problem trying to obtain a Continuous 8 to 10 Amp DC Current at 12v Using a Standard Wall Transformer? I looked at the LM196/LM396 for Voltage Regulation, but not quite sure of the Primary Device To absorb The Current Load... Thanks For The Help Anyhow..Much Appreciated..

Hi, didn't know the best way to post my Subject without it being confusing, so this is what I'm attempting to do: I want to build a power supply that I can plug into a normal 120v AC wall outlet and supply the neccessary Voltage and Amperage to operate a standard 12v Automotive Fuel pump... I guess my biggest Challenge Is to first find out the average DC Amperage it takes to sufficiently run the Motor (Fuel Pump), and then have the proper Durable Tranformer etc.. to compensate for a standard Automotive Battery... Any help is Much Appreciated.. It's a little project I'm Attempting to build for testing Injectors... If I can Find the Average Operating DC Amperage for the Fuel Pump, That Will Be a Big Step...Thanks..

I notice many microcontroller projects actually use the serial, Parrallel, or USB for the Data transfer and Flashing Process... My question is: How much trouble would it be to have the PIC read its info from a standard Floppy drive? Therefore, you could copy your Programs to floppy disk and use the disk to flash the Microcontroller (PIC).. Would make your PIC more mobile... Is this a problem creating?

Thanks for the optional solutions, .. MP, the punches sound like a good idea, I just wonder if some company offers die sets that can actually punch out Pre-Formed holes, (8, 16, pin chip holes) and/or 3 and 2 Pin for Trans and Resistors.. That would be cool and very time saving.. Probably quite expensive although.. by the way sasi, how efficient is the hand drill you use? Does it take one push to get your hole? If so, that's not a bad tool...

Once again audioguru, Thanks, In fact I have a small veroboard, just always thought it was only for particular type circuits that could use the layout it presents... Now I see otherwise...

Hello, I just wanted to know if there is any other method other than drilling, such as a Punch Tool, that is capable of putting the Pin Holes on a circuit board for hobbiest? And about how much would an actual Plot machine cost for putting the pin holes in circuit boards that you design on your computer? Probably more than I can ask the question.. :'(

Hi, halo69_2003, seems you have some decent items to get started with, I would probably suggest doing a project that you can find useful for days to come... Not something you might create and find in the closet in a few weeks :) .. Personally, I like the LED Multimeter because I have a very good LCD meter I brought from Radio Shack a while back that tests Caps, Transistors, Diodes, etc.. BUT, I can't stand the LCD It has no backlight! Makes it frustrating in low light conditions... So i am very eager to make the sinple LED Meter for that reason alone.. Good luck on your decision...