I have been looking at the "which toggle to use for Charlize soft start". I would like to incorporate a soft start into my S.I amp. The red switch leads are not polarised + & -. I assume therefore that it does not matter how they are connected to the switch. If I got an OFF, ON, ON switch would that be o.k and what is the best way to connect a resistor to get a soft start ? I assume the switch will have 3 terminals and (and as a novice at all this) would I be right in thinking that the resistor gets attached to one of the red leads only, or is it connected between the OFF and first ON position. Any help you can give would be greatly appreciated.
Sorry, I forgot to say that it seems that it might be difficult to get hold of an OFF,ON,ON switch. I can get an ON, ON switch, would that do and so the same question applies as before, where do the connections go. Thanks.
dunno if a soft start (resistor type) will work with the sonic impact amp.
with the charlize, you can use a simple OFF-ON switch (spst) and put a resistor across. in OFF position the amp will be fed by the psu via the resistor (+/- 4v going to the amp) and when you flip the switch to ON it will by-pass the resistor feeding the amp direct from the psu at 12v. you need another switch though to cut the psu as it will feed the amp even in OFF position. in my case i have another switch that directly cuts the 220v going to the psu.
with the charlize, you can use a simple OFF-ON switch (spst) and put a resistor across. in OFF position the amp will be fed by the psu via the resistor (+/- 4v going to the amp) and when you flip the switch to ON it will by-pass the resistor feeding the amp direct from the psu at 12v. you need another switch though to cut the psu as it will feed the amp even in OFF position. in my case i have another switch that directly cuts the 220v going to the psu.
OFF-ON-ON may seem the "best" way but certainly with a submin toggle I find ON-OFF-ON is easier to manipulate and the switches are more common. With a plain SPDT (ON-ON) (or any manual soft-start, come to that) I'm not sure what effect leaving the amp on a strangled supply would have. 😕
The resistor goes across the two 'ON' pins, a red lead to one of them, the other red to the common pin. Which pin depends on whether your convention is 'up for on' or 'down for on'.
Main value with the T-Amp will be to gently pre-charge the big stiffener cap you've added should your psu object.
The resistor goes across the two 'ON' pins, a red lead to one of them, the other red to the common pin. Which pin depends on whether your convention is 'up for on' or 'down for on'.
Main value with the T-Amp will be to gently pre-charge the big stiffener cap you've added should your psu object.
cpemma. Thanks for that. The way you have described the wiring up, is that for an ON-OFF-ON switch ? I seem to remember that panomaniac suggested this for the charlize. It means a quick up(or down) from the first ON position to FULL on (2nd on position) passing the OFF position.
I think ?
I think ?
http://www.diyaudio.com/forums/showthread.php?threadid=76504
I posted my soft start circuit a little while back and Michael showed us the one the Super-T amp uses. You can make either circuit on perf board for a few dollars in parts. You just need to give it power, ground, and run the soft start signal to the mute pin (after you lift or disconnect the mute pin from the circuit) and it will work every time you power up the amp.
I posted my soft start circuit a little while back and Michael showed us the one the Super-T amp uses. You can make either circuit on perf board for a few dollars in parts. You just need to give it power, ground, and run the soft start signal to the mute pin (after you lift or disconnect the mute pin from the circuit) and it will work every time you power up the amp.
Thanks BWRX. However, I think it would be beyond my capabilities and a simple resistor solution as suggested by cpemma is far more to my liking. Do you have any comments on the resistor suggestion ?
Puffin said:
u can also refer to this thread regarding the function of spdt (ON-ON) and spst (OFF-ON) to use for the resistor based soft start config.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=74942&perpage=10&pagenumber=2
Puffin said:
Correct, but resistor across the two 'ON' outputs with supply wire from the one chosen as 'Full ON' applies to any 3-position switch. I see RS do an SP ON-ON-ON min toggle that could be used as an OFF-ON-ON (with the first 'ON' not connected), 344-710 is the code and pin-out is on the page.
Puffin said:
You gotta start somewhere! Anyone is capable of building a circuit like this. Just take your time. It's fun... really it is 😉
I prefer either my circuit or the one Micheal posted over switching a resistor in and out of the power lead, but it does work and is simple to implement. Whatever floats your boat I guess.
BWRX said:
That's the bit that scares the crap out of me.
Too many better men than I have broken their toys.
- Status
- Not open for further replies.