HCF Counters/dividers. MEDIUM SPEED OPERATION: 10 MHz (Typ.) at VDD = 10V FULLY STATIC OPERATION STANDARDIZED SYMMETRICAL. HCF datasheet, HCF circuit, HCF data sheet: STMICROELECTRONICS – COUNTERS/DIVIDERS,alldatasheet, datasheet, Datasheet search site. HCF Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for HCF Semiconductors.
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Weird behaviour | Electronics Forum (Circuits, Projects and Microcontrollers)
Got part of the scheme from internet Knight Rider lights for model cars and extended it myself with another additional chip to use 8 LEDs in this “back and forth” configuration.
The problem is, I’ve got the timer to work, no problem there, can adjust the pulsing speed with a k potentiometer just mounted a LED to pin 3 with a ohm resistorno problems there. But, when I connect pin 3 from the timer to pin 14 from the chip and of course the 0V, reset and enable pins to the 0V linethe output is kinda weird.
But, it flashes totally randomly and in variating brightness also totally random. This stays the same when I mount more LEDs to the other ports, it’s not how it’s supposed to be. Does anyone know what I did wrong? Can’t find any errors in my configuration. Btw, I’m using a 12 – 13,5v accumulator as a powersource.
You do have a resistor in series with the LED? How much current are you trying to draw from the pin? I think this is what you want? Did you try to sequence two? Boncuk New Member Oct 6, The circuit will work alright if you cascade the counters. Well I haven’t ground pin 11 indeed. Should I do that?
Yes that was my first attempt but it failed so hard I switched back to just one chip, but it still behaves very odd. So well, the cascading comes for later.
But now I’m not even getting one chip to work right. Smonjirez New Member Oct 8, Your CD is not connected to 0V so it cannot do anything. I don’t see the important supply bypass capacitors. The datasheet for the LM says to use a 0. If you don’t then the circuit probably will not work properly. Smonjirez New Member Oct 9, I think you are talking about the 0,1uF capacitor which should be connected to pin 5 control? According to the datasheets I followed it isn’t nessecary to connect pin 5.
Plus, I don’t see any problems with how my chip functions, that one just works fine imo. But if you’re talking about another condensator connected to another input or something, could you please modify my circuit and post it?
(PDF) HCF4017 Datasheet download
Else I still have no idea what to do. Boncuk New Member Oct 9, Hi, that is what audioguru tried to make clear to you. The control pin has nothing to do with decoupling.
Attached is a proper decoupling circuitry for the NE If output current is close to maximum increase the value of C1 accordingly.
The datasheet for the Cmos Intersil’s ICM shows that hvf4017 ordinary causes a supply current spike of mA when its output switches.