A
Allen Bong
- Jan 1, 1970
- 0
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 www.tech-chat.de)
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
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 www.tech-chat.de)
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