I am using two perimeter mics via a small mixer to monitor outside buildings. I now want to connect this to my old Nokia 1200 to do off-site monitoring. Any suggestions?
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What cheap or free Basic compilers are being used for programming PICs?
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What is the easiest or best way to PWM a PIC16F690? I've seen Chuck Hellebuyck's book, but he uses an external pot to manually do it. I need to do it in software.
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There was a thread on a Microchip forum that may help. www.microchip.com/forums/tm.aspx?high=&m=697725&mpage=1
Could someone come up with a simple schematic for a blinking LED (clear but blinks red)? The item would use an NTE5405 SCR, a high intensity (MSD) LED, and an LSR (light sensitive resistor), all driven by a nine volt battery. The purpose would be for the blinking light to remain out during the day but would come on at night and blink about once every seven seconds. It would then go out during the daytime.
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I am looking for an AC/DC transformer with a variable voltage input of 47 VAC to 277 VAC, with a secondary output of 12 VDC.
Does anyone know where I can find one or have one made?
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I'd like a circuit to power LEDs or an electro-luminescent display to be used as a "Recording" light in a small studio. Ideally, the sign would come on fully for several seconds at first, and then flash on and off slowly, ramping the voltage to the display or LEDs up and down, so as to create a soft blinking display.
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I was wondering if it would be possible to cheaply build a system in which I speak into a CB type radio, and have the signal sent to a loudspeaker about 1,000 feet away or slightly more? The current system I have is a bullhorn, and I have to stand a good distance back from the crowd to accomplish my task. It kills my voice. I was thinking if I could buy a loudspeaker (what wattage?) and a set of CBs that I should be able to modify the other CB to feed into the amplified loudspeaker so I can simply talk into it.
Surely there is a commercial version, but I'd like to be able to do it on the cheap if possible.
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How can a long range wireless RS-232 link between two computers be built? I'd be very interested in how to get an effective range of 3-5 miles.
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I am a beginner using a Parallax BASIC Stamp kit #555-28158. How do I wire seven LEDs and program them to come on and off in certain orders or patterns? Is it possible with this kit?
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Our church has analog controlled dimmer modules. The controller has four scenes learned in some type of memory. After a power failure, the controller does not know the state it was in at the time of the failure. The default setting is that the controller selects scene 4 after the power is restored.
Since most of the time the power interruptions are at night when the church is not occupied, the system is wasting energy. For safety reasons, this was acceptable at one time, but the cost of energy is a concern. The four scenes and off modes are selected by a momentary contact closure. The manufacturer solution is to upgrade to digital control.
Is there a circuit design using a microcontroller that could capture the state the controller was in at the time of the power failure and restore the controller to the mode after power is available?
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