Soft Start / Missing Cycle Detector / On-Off Mute Controller - diyAudio
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Old 5th January 2015, 11:18 AM   #1
FdW is offline FdW  Netherlands
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Default Soft Start / Missing Cycle Detector / On-Off Mute Controller

All,

Soft Start / Missing Cycle Detector / On-Off Mute Controller

In the past few weeks I have developed a soft-start circuit with mute-control. The circuit is shown here. My question is, is there anybody interested in this project and if so what would you like to see (added/changed). Also I did select a mains transformer and the relays to be used (by me). What transformer/relay footprint would you like to see on a future board.

Have a look at the scheme and let me know what you think about it.

Frans.

Transformer: http://www.block.eu/en_US/products/720897.htm ECO 2003 Primair: 230 V Secundair: 12 V 125 mA 1.5 VA ECO2003-1,5S12
Relay's: JVN1A-12V-F Panasonic Electric Works | 255-2362-ND | DigiKey
NTC's: Amphenol 527-CL40 Inschakelstroombegrenzers | Mouser

Update:
Thanks to gmphadte, improved version @ Soft Start / Missing Cycle Detector / On-Off Mute Controller (Post #10)

Update:
Less components @ Soft Start / Missing Cycle Detector / On-Off Mute Controller (Post #11)

Update:
Two diodes less @ Soft Start / Missing Cycle Detector / On-Off Mute Controller (Post #14)

Update:
Enhanced muting timing @ Soft Start / Missing Cycle Detector / On-Off Mute Controller (Post #15)
Attached Images
File Type: png SSD BIG4BT V5, Power Switch.png (82.5 KB, 346 views)
File Type: png SSD BIG4BT V5, Power Switch; Events.png (21.7 KB, 328 views)

Last edited by FdW; 24th January 2015 at 02:07 PM.
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Old 6th January 2015, 11:05 AM   #2
FdW is offline FdW  Netherlands
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No one, please give me some sign of life
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Old 6th January 2015, 02:14 PM   #3
Ketje is offline Ketje  Belgium
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Something like shooting a mosquito with an elefant gun ?
Mona
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Old 6th January 2015, 03:56 PM   #4
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Ketje View Post
Something like shooting a mosquito with an elefant gun ?
Mona
Why not But it's all very cheap, a hand full of carbon resistors and about the cheapest transistors will do. Only the relay and transformer cost a bit. The three things that I absolutely need are the safety of the missing cycle detector, the control for muting and the soft-start for my amplifier (it has a 2KW linear PSU).

Total construction cost will be low(ish) so I thought maybe someone else wants a few or is interested in a thing like this.
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Old 6th January 2015, 08:57 PM   #5
Ketje is offline Ketje  Belgium
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Shure for a diy-er a resistor more or less...
It was't ment that negative, more as a first cheap to get things going :-)
Mona
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Old 7th January 2015, 06:58 AM   #6
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The missing cycle detector...

you can make one with a 555.

Gajanan Phadte
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Old 7th January 2015, 08:27 AM   #7
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by gmphadte View Post
The missing cycle detector...

you can make one with a 555.

Gajanan Phadte
The missing cycle detector here is made with one transistor.
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Old 9th January 2015, 04:21 AM   #8
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D8 anode and D4 cathode reaches the same point.

You can connect D8 after the bridge followed by C2. Take missing pulse sense at anode of D8.

Gajanan Phadte
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Old 9th January 2015, 08:35 PM   #9
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by gmphadte View Post
D8 anode and D4 cathode reaches the same point.

You can connect D8 after the bridge followed by C2. Take missing pulse sense at anode of D8.

Gajanan Phadte
Yep you can, but the bridge will be a 3n256 (or alike) and then the 'extra' 1n4148 is o.k.

Edit: On second thought the answer should have been 'Yes'

P.s. I have to check the timing for that, in the current scheme there is a 20mS gap and after that mod it is a 10mS gap (but full wave detect). So I will check that, thanks.

Last edited by FdW; 9th January 2015 at 08:39 PM.
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Old 10th January 2015, 08:13 PM   #10
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by gmphadte View Post
D8 anode and D4 cathode reaches the same point.

You can connect D8 after the bridge followed by C2. Take missing pulse sense at anode of D8.

Gajanan Phadte
Attached is an updated schema, with updated timing to detect half-cycle-dropouts.
Attached Images
File Type: png SSD BIG4BT V5, Power Switch; Events.png (71.8 KB, 115 views)
File Type: png SSD BIG4BT V5, Power Switch.png (93.2 KB, 110 views)
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