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Hey all, for those who don't know, a color organ is a fun circuit to build that flashes lights in response- frequency based- to music input from a source.
Anyway, I designed a circuit that uses a signal input that doesn't rely on a built in microphone- most designs that I found online did.
I...
A quick question for those who know more than me, why does the LED flash brightly for some time then start dimming? Is it my component values. R1 and R2 both 100k, and C1 0.47 uF.
led flasher 555 circuit
A basic astable mode circuit. R1 is a 500k pot (100k pot will work as well), R2 is 100k, and C1 is 0.47uF and C2 is .01uF.
Wanting about 10-14 flashes per second, and as I said, I hookup, triple and quadruple check all connections and no joy.
flashing 555
Hey all, it's been a while.
I am building a project that needs a 555 timer IC to flash an LED, however I cannon get the LED to flash for the life of me.
I plug into the breadboard the 555 IC, the two resistors, the cap and hook up all the connections and quadruple check all...
first-response discriminator circuit
Hey all I was wondering how, without digital ICs, one would make a first response discriminator for say a game. Basically it needs to detect the first signal and then reject all others, but as I said using only transistors and other discrete components, I...
Hey all,
I am designing a three channel mixer for mobile use (like ipod + ham radio + cell phone.) I had a few questions. First, there seems to be little info anywhere about what input resistor values to use. I know that the shunt resistors in first set the input impedance but what values are...
Hi, I am designing a three channel mixer of sorts for audio. I was wondering what amplifier is best suited for summing the three sources ( I want to keep it stereo so there will be two.) I was planning on an emitter follower but if anyone has a better way please let me know.
Also, to kill two...
PCB design at RF
I am planning on working around 0-30MHz (the HF ham bands) so as far as I can tell the lower the freq. the easier, so I may be in luck.
RF voltages/ currents
How does one calculate the RF voltage or current going through say a coaxial cable, is it by the impedance of the cable and the amount of power?
PCB design at RF
Hey you guys have been very helpful with most all of my project, I had a few question about designing PCB at RF freq. Are there any major advantages/ disadvantages? Also can anyone help to define RF design practices, the most of what I see is to keep lengths as short as...
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