Soft Switch with Soft Start
Hi Rob,
I got all 4 of my soft switch and soft start boards finished. The soft switch boards are all working perfectly. I wanted to check with you to be sure that the soft starts are also working properly though.
They all do exactly the same thing when testing under no load conditions (just using a DMM to measure output voltage):
As soon as I turn on the soft switch, the soft start output jumps rapidly to full voltage before the relay trips. The pot adjustment for the delay works.....the delay of the relay is adjustable. But there is no change in the output voltage when the relay trips since it is already up to full input voltage.
Does this sound like they are working properly? Since the purpose is to limit current rather than voltage, my measurements may not mean anything?
Thanks! These are nice little switches.
Robert
Hi Rob,
I got all 4 of my soft switch and soft start boards finished. The soft switch boards are all working perfectly. I wanted to check with you to be sure that the soft starts are also working properly though.
They all do exactly the same thing when testing under no load conditions (just using a DMM to measure output voltage):
As soon as I turn on the soft switch, the soft start output jumps rapidly to full voltage before the relay trips. The pot adjustment for the delay works.....the delay of the relay is adjustable. But there is no change in the output voltage when the relay trips since it is already up to full input voltage.
Does this sound like they are working properly? Since the purpose is to limit current rather than voltage, my measurements may not mean anything?
Thanks! These are nice little switches.
Robert
Re: Soft Switch with Soft Start
Robert, this is a normal measurement. It as a voltage divider with 25 ohms in series, and 10 Meg shunt resistor (typical Rin of DMM). Vout=Vin*[10M/(25+10M)] => Vout=Vin.
The way to tell that the soft start is working properly is to listen for the delay of the latching relay.
--Rob
rjkdivin said:
Robert, this is a normal measurement. It as a voltage divider with 25 ohms in series, and 10 Meg shunt resistor (typical Rin of DMM). Vout=Vin*[10M/(25+10M)] => Vout=Vin.
The way to tell that the soft start is working properly is to listen for the delay of the latching relay.
--Rob
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jleaman said:
Did I not include schematics, layouts, bill of materials, and assembly drawings in the package? If you don't have them, I apologize for forgetting them. You can find them on my site:
http://www.robcheng.com
Click on Audio -> Electronics -> Soft Switch V2
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You sent me a bill of material's but it does not show what part is witch.
example resistor 1003 means what ? or 1001
Also on the corner of the pcb it says r8 510 and looking at r8 on the x-cell sheet i see
R7, R8 Resistor 1K 5% SMD 1206 Panasonic
So im a little confused if i could see the bottom of some ones that works Id be happy.. Im going to stop tonight. So far i have a few 22k resistors mounted.and the 7812 and the bridge rectifier.
On another note i see this on the x-cell sheet
R1, R2, R6, R9, R10, R12 Resistor 22K 5% SMD 1206 Panasonic ERJ-8GEYJ223V
but on the board r6 says 1k. Soo.....
example resistor 1003 means what ? or 1001
Also on the corner of the pcb it says r8 510 and looking at r8 on the x-cell sheet i see
R7, R8 Resistor 1K 5% SMD 1206 Panasonic
So im a little confused
if i could see the bottom of some ones that works Id be happy.. Im going to stop tonight. So far i have a few 22k resistors mounted.and the 7812 and the bridge rectifier. On another note i see this on the x-cell sheet
R1, R2, R6, R9, R10, R12 Resistor 22K 5% SMD 1206 Panasonic ERJ-8GEYJ223V
but on the board r6 says 1k. Soo.....
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Joined 2002
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Maxhawk said:
what about R8 ?
On the board it says 510. then on the xcell it says Resistor 1K 5% SMD 1206.
another question.
Resistor 1MEG 5% SMD 1206
Resistor 100K 5% SMD 1206
How do i figure out what value is what ?
:0 i ask only, this way i dont cry saying please send me new board i killed this one
Pics
These pictures may or may not help....I made them about as big as I thought would upload okay.
This is the soft switch and softstart wired together and using the lighted momentary contact switch. They work great....this set is going into my Krell KSA50 clone.
These pictures may or may not help....I made them about as big as I thought would upload okay.
This is the soft switch and softstart wired together and using the lighted momentary contact switch. They work great....this set is going into my Krell KSA50 clone.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
R8 is the series resistor for the switch LED. You can change the value to adjust the brightness so the value is not critical. But you don't want to make it too small causing too much current to flow. My excel sheet says R8 is 510 ohms. Just checked the version on the website and it's an old version. I'll fix it now.
I don't understand the question. The values are in the description. The first one is 1 megaohm and the 2nd is 100K.
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