Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

On/Off switch using momentary push button
On/Off switch using momentary push button
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th December 2017, 04:56 PM   #21
reedcat is offline reedcat  United States
diyAudio Member
 
Join Date: Aug 2017
Bobsone, thank you for the resources. There are a lot of schematics here as well (found via one of your links):
Circuits Page 9
All require a low voltage DC supply.

Following the KISS principle I ordered a latching push button switch on Amazon. Apparently they have the best prices, beating Digikey and Mouser sometimes by 50%:
Amazon.com: Pushbutton Switches - Switches & Relays: Automotive
  Reply With Quote
Old 7th December 2017, 05:27 PM   #22
russc is offline russc  England
diyAudio Member
 
Join Date: Mar 2011
Location: W Yorkshire
For multiple momentary switches use an Arduino Nano and a ULN2001 to drive up to 7 relays.
  Reply With Quote
Old 7th December 2017, 09:58 PM   #23
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
This circuit emulates a mechanical SPST switch controlled by a push-button.
As its mechanical model, it is 2-wire and requires no auxiliary supply.
It will waste ~1.5V ac in the ON state and leak ~1mA in the OFF state.
Since the triac is DC controlled, it is compatible with any type of load.
On a cold start, it will start in the OFF state.
The version shown is low-power (<200VA), but it can easily be upgraded; in fact, making it larger will ease the trade-offs (the load current needs to be at least 3x the Igt).
The 1N4002's and the triac need to be beefed up, but other than that, little modifications are required.
The circuit is designed for a sensitive gate triac (Igt<10mA), because it is intended for low power, but it could accommodate a standard triac if the power controlled is >100VA: the 68Ω needs to be lowered to accommodate the triac's requirement, and the 470µF's need to be increased in the same proportion

Edit: the circuit is shown with a 230V supply, but it will work with 120V as well; C3 might need to be increased if you want to switch ON and OFF repeatedly very quickly, but I don't think it is advisable anyway
Attached Images
File Type: png ACtoggle.png (22.8 KB, 120 views)
__________________
. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪

Last edited by Elvee; 7th December 2017 at 10:04 PM.
  Reply With Quote
Old 8th December 2017, 04:50 AM   #24
r_jik45 is offline r_jik45  Japan
diyAudio Member
 
Join Date: May 2005
Location: Jpn, Fr
Hi,

Thinking to make a simplified version (without the led and its resistor) of the circuit proposed by Bobsone with a 2 poles relay to switch ON/OFF a poweramp.

So, related to the circuit from Bobsone's first link (Toggle ON / OFF Switch - Electronics-Lab) and the schematics in the Circuits Page 9 (Circuits Page 9), I'm not sure to correctly understand "One disadvantage is the relay may be engaged when power is first applied. To solve this problem, you could tie the reset line (pin 4) to another resistor/capacitor combination with the capacitor at ground and the resistor at the +V point. This will cause pin 4 to be held near ground for a short period which will reset the output when power is applied.".
Does it mean that pins 8 and 4 of the 555 have to be disconnected (leaving pin 8 connected to the +V) and that the pin 4 alone has to be connected to the +V through a resistor and to the ground through a capacitor? Which values then for these R and C?
Thanks in advance for replies/comments!
  Reply With Quote
Old 8th December 2017, 06:58 AM   #25
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Quote:
Originally Posted by reedcat View Post
Edit: will something like attached work (given I use main AC rated relay and supply 120VAC instead of 12DC as pictured)?
Yes. This is THE way to do it when relays are more fashionable than sand-state. Millions of factory machines use just that plan.

You have noted that it needs two buttons (or an on/off/on 3-position switch)?
  Reply With Quote
Old 8th December 2017, 07:21 AM   #26
mchambin is offline mchambin  France
diyAudio Member
 
Join Date: Mar 2011
Push Button ON/OFF for household electicity in France is just a cheap standard module at the electric panel typically used to ON/OFF lights from several push buttons.
About $15 10A 220V capable.
The latching is mechanical. Cannot be simpler, more reliable and safe.
__________________
Transistor junction temperature is not transistor case temperature.
  Reply With Quote
Old 10th December 2017, 02:58 AM   #27
r_jik45 is offline r_jik45  Japan
diyAudio Member
 
Join Date: May 2005
Location: Jpn, Fr
Do you mean an old fashion 'télérupteur' (or latching switch according to wikipedia)?
Well... it's rather bulky and noisy, and the push button is not really aesthetic on the front panel

Anyway, I will try to set a circuit to command a 2 poles relay. Still have to get one to check the connections.
  Reply With Quote
Old 10th December 2017, 03:27 AM   #28
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
You can do it with your switch but would need a set/reset debounce circuit driving into a D type flip flop then into a relay. The d type flip flop might need a reset circuit so it doesn't power up in on state.
__________________
PCBCAD51 pcb design software. 2018 version out now >>>>>> http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 10th December 2017, 03:44 AM   #29
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Or a simple mechanical device: a ratchet relay.

(Sadly "obsolete" and very hard to find now.)
Attached Images
File Type: jpg ratchet-relay.jpg (256.1 KB, 76 views)
  Reply With Quote
Old 10th December 2017, 04:13 AM   #30
mchambin is offline mchambin  France
diyAudio Member
 
Join Date: Mar 2011
Quote:
Originally Posted by r_jik45 View Post
Do you mean an old fashion 'télérupteur' (or latching switch according to wikipedia)?
Well... it's rather bulky and noisy, and the push button is not really aesthetic on the front panel
Yes, the name is 'telerupteur' in French, the push button can be any switch as long as it can feed 220V ac to the relay coil of the telerupteur.
Indeed, it is noisy....well, you do know when it switches.
__________________
Transistor junction temperature is not transistor case temperature.

Last edited by mchambin; 10th December 2017 at 04:15 AM.
  Reply With Quote

Reply


On/Off switch using momentary push buttonHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Push button power On/Off switch for a 10 mm front panel NicMac Parts 7 22nd February 2010 09:24 PM
What type of momentary switch Nordic Parts 1 8th October 2006 10:47 AM
Momentary Switch mourip Parts 11 26th June 2006 10:53 PM
Need help finding push button power switch to fit my amp Ken C Solid State 4 13th July 2004 12:42 AM
Using a momentary switch for main power switch? FullThrottleRic Parts 9 25th June 2002 09:23 PM


New To Site? Need Help?

All times are GMT. The time now is 10:59 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki