This thread is for discussions about the Speaker Turn-On Delay and DC Protector board (V2). This has now been superceeded by the V3 generation of the board which essentially is the same board with a different layout compatible with our 10x10 grid pattern.
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If you are considering a second run of the 'Soft Start' pcb, could you include a simple DC Trap, as any dc component is 'bad news' (for torroids especially) and is now common in all of our main supplies - just requires a couple of caps and diodes directly in line with the active mains line that's already on the board - plus, while the mains is so readily available, perhaps add a simple 'Line filter' to complete the set.
Use of DC Supply instead of AC
Hello,
If I want to use DC voltage :
- I don't need C6 and I can use a strap instead of D6,
- I must use K1-1 as the positiv and K2 for ground
Is that right ?
I have 12volts relays, what range of DC voltage can I use ?
How much current do I need ?
Thank You for your response.
Eric
Hello,
If I want to use DC voltage :
- I don't need C6 and I can use a strap instead of D6,
- I must use K1-1 as the positiv and K2 for ground
Is that right ?
I have 12volts relays, what range of DC voltage can I use ?
How much current do I need ?
Thank You for your response.
Eric
If you have available 12V to 15V DC then you don't need D6 and C6, but be mindful of the polarity when you do. Make sure the positive goes to the line going to D6 position. 500mA to 750mA should be more than enough.
I'm not sure what you mean by "I must use K1-1 as the positiv and K2 for ground"
Yes that should work. But if your relays are rated 12V then you need 24V DC supply, not 12V-15V only as the relays will not engage.
It is a standard 5-PIN SPDT G5L relay, you shouldn't have any problem looking for that in digikey.
Here's an example...
G5LA-14 DC12 Omron Electronics Inc-EMC Div | Z2561-ND | DigiKey
In my experience with using it, the turn-off depends with the supply connected to the Speaker Protector.
So if you are to use the same power supply used to power the ACA then during turn-off the power is drained faster so the speaker cutoff can be faster. Though I do not know if this is fast enough for the ACA turn off thump.
So if you are to use the same power supply used to power the ACA then during turn-off the power is drained faster so the speaker cutoff can be faster. Though I do not know if this is fast enough for the ACA turn off thump.
I haven't tried that actually, but I bet it will work with the BC550 without any problems. You will however need to twist the transistor leads as the the C945 are E-C-B while the BC550 are E-B-C.
As for the 9013 I think it's ok too, just watch out for the transistor lead orientation.
Cheers!
As for the 9013 I think it's ok too, just watch out for the transistor lead orientation.
Cheers!
well, I used to do that at my former work because I think the designer of the board and the company's purchaser were both drunk. the designer designed the board for the wrong transistors while the purchaser ordered the wrong transistor. 
please do let us in on the results so we can have this included in our FAQ to help other builders.
please do let us in on the results so we can have this included in our FAQ to help other builders.
I just tested the circuit, relays are working good, I tested it according to the instructions.
One thing, though, the LED that is supposed to blink and then go ON, is constantly ON. Any thoughts why would that be?
Transistors I'm using are 2N5232 and MPSA06. All other parts are according to the BOM.
Ah yes the LED I'm talking about is PURPLE!!!
One thing, though, the LED that is supposed to blink and then go ON, is constantly ON. Any thoughts why would that be?
Transistors I'm using are 2N5232 and MPSA06. All other parts are according to the BOM.
Ah yes the LED I'm talking about is PURPLE!!!
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