Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [cd4017]

5-stage Johnson counter having 10 decoded outputs. Inputs include a CLOCK, a RESET and a CLOCK INHIBIT signal. Permits high-speed operation, 2-input decode-gating and spike-free outputs.

37 questions
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Resetting two CD4017 counters simultaneously, only one resets

I am working on a simple 24-hour clock based on the CD4017. To reset when the clock reaches the 24th hour, two diodes are used to produce an "and" logic when the 2 digit and 4 digit LEDs receive a high output from the CD4017. The output from these…
Harrito
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CD4017 resetting itself when load connected

Ok to the issue I have been plagued with for some time now. The circuit is powered by a 4s Battery Pack (max VBAT = 16.8V, well below the CD4017 max V of 20V) After the Power-ON stage it is branched out to Voltage Regulators, see below. I have…
Aotearoa_DEV
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Light bulb lights up in a fraction of time (blinks) using TRIAC-BT136 and MOC3021 (Solved)

I have several days with problems when assembling the circuit of the image (it is a light bulb that turns on when you clap). To briefly describe the operation of the circuit, when the potentiometer is completely to the left, the led and the bulb…
aticboy
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How to Prevent CD4017 from Resetting to Random Count on Power On

I'm working on a project using a couple of CD4017 decade counter chips sharing a clock signal from a 555 oscillator. The ideal behavior I would expect is that the chips would all start on count 0 when given power. They do this most of the time but…
Emmett Palaima
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Unable to trigger NPN Transistor from 4017 decade counter output

I am trying to make a unipolar stepper motor driver circuit. As a development landmark, I am trying to first run LEDs using the driver. Attached is my circuit. My 555 timer generates regular pulses for the decade counter. The outputs (0-3) of the…
Anurag
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On-- off-- on-- off timer circuit

I want to make a circuit to do something that is relatively simple but I need to find the optimal way to do it in order to take as little current as possible. Here is what I want to do: When a trigger is activated, it launches a cycle. A cycle…
Pierre-Luc
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4017 IC block diagram

I am really confused with the block diagram of 4017 IC. Here's the dataheet. I really can't wrap my head around the way they have taken the output for each count. They are just taking two flip to choose the state. Shouldn't they take all four? The…
G-aura-V
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Simple Mosfet driver

I need to switch 8 IRF9540 (P-Channel Mosfets) with about 32kHz (so 1 MOSFET about 4kHz) so that only one is On at one time. I thought about using the decade counter 4017 for this, and the 555 Timer for driving the 4017. Because of the low output…
Ribisl
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How can I simulate an 8 LED (complemented) pattern device?

How can I simulate an 8 led with timer and ic? I have tried simulating it like this but still it’s not working, it blinks for less than a second and then it turns off I want it to work like First all LED ON, then only 7 LEDs ON, then only 6 LEDs…
Maryam
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lock the 10 outputs of 4017 to HIGH

I am a beginner in electronics. For a project I have to use five 4017 counter and I understood how they works: one of ten outputs is high at the same time. But at some time, I need to set HIGH the 10 outputs of the five counters simultaneously. In…
Jean-Paul Sabatier
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Circuit to reset a 4017 decade counter to 1

I have a need for a circuit with cascading outputs such as a 4017 chip. I want every output to be able to reset the circuit using a jumper. I was thinking to make a pcb with solder jumpers so one gets to choose which of the outputs resets the…
bask185
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Why does this 8 step sequencer schematic need two resistors for each output pin?

I've found a schematic online for an 8 step sequencer and built it on a breadboard. Before I start experimenting with it and adding features, I'd like to find out if both 10k resistors are needed for each NPN transistor pair. Here is the…
Marlon
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Increasing LED brightness on arduino-controlled 8x10 LED matrix

I have made an 8x10 LED matrix, controlled using a CD4017 decade counter and Arduino. A simplified schematic is shown below: In the real version, there are 8 Arduino pins, and all 10 outputs of the decade counter are used (I have only shown a 4x4…
J. Barker
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What is the voltage on CD4017 outputs?

What is the voltage of "high" signal on "out" pins? Do I understand it correctly, that it is dependent only on provided Vdd and it is a little (approx. 0.5 V) lower than Vdd?
Scientist known as Rick
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Triggering CD4026 Reset w/ a CD4017

I am trying to get a CD4026 IC to reset at 6 for a digital clock project. I have some 3-input AND gate IC's but there doesn't seem to any unique conditions that would work. I do have some CD4017 and was thinking I could use them to trigger the…
BobaJFET
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