Something not too complicated. Easy but interesting. I made a AM receiver before. Something that doesn't use too many ICs. Mainly transistors, resistors, capacitors, etc...
201911
nicad battery charger?\naudio amplifier?\ncar voltage tester? \nappliance timer, (turn off TV in 1 hour)\ncooking timer, (beeps after 10 minutes, 20 , 30 minutes)\nMIKE
79515
You have the classic case of "a solution looking for a problem". That's always a little frustrating. It just sounds like you don't have enough materials there. If you buy another small electronics kit, then you can have more things to play with.\nOne thing that comes to mind is an alarm clock. Hook up the led and buzzer to an existing alarm clock and make it sound in unison.\nAnother thing could be to create an "phone ringing alert". When you land line rings, have your contraption light up and  buzz, so that you might know that the phone is ringing if you can't find it.\nIf you add a remote trigger, you can make a remote control finder. The tricky part might be to attach it to the remote.\nOh, another great idea is to make a timer for the kitchen. That's always useful. You can somehow integrate the machine into something cool, like a darth vader pez or something, and add a timer you can buy at Wal-Mart for 5 bucks.\nAlso you could make a marbles game kind of like Pachinko: a long board with slots and one end, and you let a ball fall from the other end (like a slide) and the ball has to fall at a certain slot and it makes the buzzer go off.\nVisit site below for ideas
56653
odds are, that you would be beter off buying a manufactued device, dc to ac inverters are very complicated and have many different circuits. not only that, but for you to make something that can invert that much power would need an extreme amount of skill to to get the proper components. I would recomend geting a manufactured model from marine purposes perhaps. Some companies should offer custom built electronics.
434894
You can use an integrated circuit, like LTC6906 from Linear Technology which goes up to 1MHz at 2.25 - 5VDC supply,\nsee:  http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1010,C1096,P9790,D6998\nAlternative: MAX5094A by Maxim,  see:  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5017\nI didn't have the time to check the output power, but if it's not enough, a simple emitter stage transistor will do.
509841
If you want to build it to a specific value, I recomend getting a copy of The Radio Amateurs Handbook from your local library.  It has info and formula for air core, ferrite core, and toroid core inductors.  You might try their website www.arrl.com
90049
Very Nobel interest. If you can build it then let me know. Here are the tips from me. Use FM band to for the controls, if you can have a digital control system then you can operate that with a high and low pulse from the ground. And if its a toy plane then there shouldn't be more then 3 or 4 controls which should be easier to design. contact me let me know the further update on your this project and any assistance.
197982
In certain low volume and high speed circuits, transistors will always have their places. ALthough their are now many more radio chips.\nMIKE
422830
Man did u luck out running into me, go to www.sciplus.com "American science and surplus", all sorts of abandon science projects, factory over runs, cancelled government orders, motors, solar cells, weird stuff in the science dept, it's a mad doctors dream come true, CHEAP TOO ! check it out, you'll find lots of "COOL" stuff, that has many uses ! I did a hydro-electric demonstration of power application, that was so small, I could do it in a lab sink, E-mail me if you want an "A", it's an easy experiment, inexpensive, looks very sophisticated, yet simply displays the hydro-electric properties of producing low cost, hydro-electric power, using no battery's or electric for assistance, just water, so it's completely SAFE ! works on displaying milli-amps of D.C. power, yet you are still producing (at a very low voltage) power.
641706
Take your pick from http://makeashorterlink.com/?L27D5145D and print one out, perhaps?
395219
Try Behringer , or Mackie - they make a pretty good variety of models just for what you need , good price too.
654572
youll strugle to get all the functions u need for that price, if u want directs (turnables) try get hold of technics 1210s, and see if u can get hold of a cheap allen and heath mixer there very good
488653
possible that you may be talking about integrated circuits for electronic organs (musical instruments)? \n\nOtherwise are you interested in organic polymers and semi-conductors use in integrated circuit? \n\nTry some of the above on a search engine.
512533
search for a trans receiver system operating in 2.4 GHZ  ism band ,,,, no licences required for this band for a transmitter of power less than 1 watt
393289
Gallium based semi-conductor right now is too expensive to deploy. \n\nIf you want completely out of the left field, I'd go for optical processing.
6023
try the pioneer DEH-P7700mp. it's expensive ($300) but it has a 200w mosfet amp & 3 preouts & an OEL deep blue display
214283
You need something iron (like a nail) wrap the wire around to make an electromagnet. You could wrap the wood lengthways with some wire and then wrap another wire shortways around the assembly and hook to the battery but an iron core is much better. \n http://www.energyquest.ca.gov/projects/electromagnet.html\nBTW You do have most of the parts to make a simple radio receiver also.
351603
A miniature microphone (electret) and signal amplifier to trigger the device.\n\nWith the proper associated components (coil, capacitors, resisters) the operation can be activated only by a limited frequency range or volume or both.