I was constructing a circuit consisting of 20 toggling relays with 20 push buttons on a PCB measuring 7.5 by 8 inches. So I've chosen 4013 as the toggle F/F and the buttons from a VCR front panel was used to send ground to the CLOCK input of the 4013. One of the circuits is as below: (Please view in courier font)
|VCC .-. | | 4093 R | | __ '-' +---| \\ | | | )o- X +-----------------+----+---|__/ | | o | --- |=| C --- o | | | VCC GND GND | .-. +---+ | | | | \\ | |10k GND | +--+----- o o '-' | 4013 | | )| | .--o--. 1k_ |/ V )| | +-----|D S Q|------|___|--| - _)| | | | | |> +---- X +-----------|> | | | relay | | | R Qo-----+ GND | o | | '--o--' | | pb |=| | | | | o | +--------|--------+ | | | | GND VCC | | + || | 100k VCC +---||--+-|___|--+ || | 100nf | === GND
(created by AACircuit v1.28.6 beta 04/19/05
The relay was chattering seriously and sometimes when the button was pressed, nothing happened. After gathering informations, I came across the circuit using a 4093 schmitt trigger and a pair of RC as a contact debounce, but the R and C was not stated. Can someone tell me what's the best value for a tactile button with the circuit working at
12V ?Thanks you very much.
Allen