74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. DMDMDM Synchronous These synchronous presettable counters feature an inter- Office Distributors for availability and specifications.
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Whenever I press the clock button I get all of the leds on except maybe one or two, with some flashing during the button press. Finally, you should not count on TTL countter driving high, as you have shown. Also, have you added a 0. That’s probably causing as much trouble as no debounce was.
N 4-bit counter not counting properly – Electrical Engineering Stack Exchange
So your outputs should be connected like. I switched the LEDs around and connected their input to 5V and their ground to the output pins. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V.
I have added a debounce circuit, but still to 774161. I’d reduce that down to something in the nF to 1uF range.
It’s always the simple things. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
In that case, invert the signals going to your LEDs. So your outputs should be connected like simulate this sata — Schematic created using CircuitLab You may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing. Cunter you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit.
(PDF) 74161 Datasheet download
Oh, Ill change that and see what happens. I’m still getting the same effect.
TTL works much better pulling loads down. You may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing. WhatRoughBeast 49k 2 28 Sign up using Email and Password. For a circuit board with a datx plane, the usual guideline is at least one cap per 5 ICs.
– Presettable synchronous 4-bit binary counter; asynchronous reset – ChipDB
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Email Required, but never shown. Then I used a pullup resistor for the clear switch. As further issues arise I see myself stuck once more with a dysfunctional circuit. Without this buffering, your switch should not work on a button push, only on a release. Home Questions Tags Users Unanswered.