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Delay turn on circuit for amps
Delay turn on circuit for amps
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Old 24th August 2007, 04:13 AM   #21
muzza is offline muzza  Australia
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Default Loudspeaker protector

The circuit, original PCB layout and my versions are attached in seperate replies (looks like only one pic per post can be inserted)...

This is the circuit......
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File Type: jpg protector pg3a.jpg (82.8 KB, 1309 views)
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Old 24th August 2007, 04:20 AM   #22
muzza is offline muzza  Australia
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Default Loudspeaker protector

Post 2/3 ... here is the original PCB layout
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File Type: jpg 92lp8.jpg (46.6 KB, 1077 views)
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Old 24th August 2007, 04:29 AM   #23
muzza is offline muzza  Australia
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Default Loudspeaker Protector

Post 3/3..... my layout...
I've "compressed" the component density in the layout by about 15% overall, added a 3VA toriod and have inserted 6 and 4 pin headers for connection to LEDs, Channels In and Relay connection.

The device, in it's original PCB setup had options to be powered off the amplifier +ve DC rail (still needed the AC secondaries connected for on/off detect) or it could be powered by a seperate small transformer (as I have done here)..... never liked hanging other circuits off one side of the DC rails so I usually used a seperate transformer.

Have not made this board as yet as I still need to do a final check of correctness.
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File Type: jpg protector v3e.jpg (79.0 KB, 1055 views)
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Old 24th August 2007, 04:33 AM   #24
muzza is offline muzza  Australia
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Default UPC1237

Felixx ... thanks for mentioning the UPC1237.... had not come across that one.... very neat.

I'll see if I can get some and test them out.... looks like I may be in for a redesign
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Old 24th August 2007, 06:05 AM   #25
felixx is offline felixx  Europe
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I use UPC1237 in many of my amps without any problems.Is fast and very compact.
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Old 24th August 2007, 07:52 AM   #26
muzza is offline muzza  Australia
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Default UPC1237

I looked for the UPC1237.
No-one in Australia seems to carry them that I could find.
Mouser do have a NTE7100 which is the same part (no suppliers have that item in Aust either).

Very expensive to buy a handful from Mouser (they only ship via Fedex or UPS)

I've send an email to the local NTE distributor ... will wait to see what they say.

Best Regards
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Old 28th August 2007, 12:44 AM   #27
muzza is offline muzza  Australia
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Default UPC1237

OK, to get the UPC1237 or NTE7100 will cost me more per device than the cost of building the old cct I ave been using.... not worth the exercise. I cannot see any real advantage in the UPC1237/NTE7100 functionally anyway (other than board size, and that is not an issue anyway).
I will continue to use the original cct.... I know it works extremely well.
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Old 1st September 2007, 06:02 PM   #28
emmasdad is offline emmasdad  United Kingdom
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Hi! In Doug Self's Book 'Self on Audio' there is a chapter on relay muting with circuits that work very well for pre and power amps. There are also details of a soft start on a web site called 'whitenoise.co.uk', this is a commercial site but the description of the soft start unit will provide a way to go.


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Old 2nd September 2007, 09:28 AM   #29
muzza is offline muzza  Australia
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Default Speaker Protector

OK, I've had a rethink.....

The UPC1237 or NTE7100 are out for me but I had been looking around at Protector and Softstart for a while and had accummulated info on various circuits.

Have decided to do a PIC controlled version... should be able to use (e.g.) a 12F675 or similar 8 pin micro... a proper DIY project.

I've developed a range of stuff over the years using PICs and cannot see this being very complicated at all.

The last audio related PIC project I did was a decoder for my Arcam remote in my DIY preamp. The Arcam remote had Vol+, Vol- and Mute buttons and I decoded these to run the motorised pot and mute cct in my pre-amp.

I'll post the final version once done.
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Old 2nd September 2007, 09:40 AM   #30
AndrewT is offline AndrewT  Scotland
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and how long will the pic take to work out that the amp is safe to produce music.

My Cyrus delays about 6 seconds for the third relay to click before finalling bringing up the volume to the last setting.
I find these delays annoying.
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