Speaker Turn On Delay and DC Protector Board Set (V3)

[Mooly]

That looks great 👍

 

[Mooly]

We posted together jut then 🙂

I always like regulated supplies because they define the operation of the circuit much more tightly.

 

[thimios]

I see the speaker protection circuits, disconnecting speakers as soon as d.c is present in the output and connecting speakers again when d.c stops.
How we can latch the last(fault )condition,no speaker reconnection up to power reset.

 

[Mooly]

I can't just see any easy to do that at this point.

 

[prasi]

I see the speaker protection circuits, disconnecting speakers as soon as d.c is present in the output and connecting speakers again when d.c stops.
How we can latch the last(fault )condition,no speaker reconnection up to power reset.

upc1237 based ssr by bonsai?

 

[thimios]

I think that this act the same,no latch.

 

[prasi]

here is the datasheet from upc1237... it does have latching.
pin 3 does the job of latching.

 

[prasi]

Thanks prasi,please give us a Christmas 🎁.
No worries,after Christmas is ok!
Merry Christmas ⛄ to all of you!

Here are files for you my friend, if you decide to build..

 

[SRMcGee]

Prasi:

Thank you!

Regards,
Scott

 

[SRMcGee]

Prasi:

A follow-up question: what part did you specify for B2?

Regards.

 

[thimios]

Thank you my friend!

 

[prasi]

Prasi:

A follow-up question: what part did you specify for B2?

Regards.

Any of the following will work fine. 5.08mm x 7.62mm pitch.
https://www.mouser.in/c/semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers/?if - forward current=1 A&mounting style=Through Hole&package / case=DFM~~DIP-4&instock=y&sort=pricing&rp=semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers|~Package / Case

Also attaching slightly modified files, where in I have removed the solder mask for speaker traces and also added a pinheader for ground reference.

 

[HRDSTL]

@prasi again excellent work.

If I use one pcb for the right channel and one for the left channel, what changes do you recommend?

R15 value?
omit U$1, Q9, Q10,
U$1 pin 1 to 2 jumper

 

[prasi]

Thanks HRDSTL,
yes, omit Q9, Q10, jumper U$1 pin 1-2, omit R12 (27k) also
R15 of about 560 ohm 0.5W to 1W would do.

 

[Monk55]

Any of the following will work fine. 5.08mm x 7.62mm pitch.
https://www.mouser.in/c/semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers/?if - forward current=1 A&mounting style=Through Hole&package / case=DFM~~DIP-4&instock=y&sort=pricing&rp=semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers|~Package / Case

Also attaching slightly modified files, where in I have removed the solder mask for speaker traces and also added a pinheader for ground reference.

Any changes to this design? Has it been proven to work?
thanks very much

 

[SRMcGee]

Prasi (and others):

Can you please offer some guidance as to how to test for and calculate any adjustments to R15?

Thank you,
Scott

 

[Monk55]

Size R15, for 20-25ma through optocoupler

 

[Chrisr3521]

Any of the following will work fine. 5.08mm x 7.62mm pitch.
https://www.mouser.in/c/semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers/?if - forward current=1 A&mounting style=Through Hole&package / case=DFM~~DIP-4&instock=y&sort=pricing&rp=semiconductors/discrete-semiconductors/diodes-rectifiers/bridge-rectifiers|~Package / Case

Also attaching slightly modified files, where in I have removed the solder mask for speaker traces and also added a pinheader for ground reference.

Whats the time on the turn on delay and how would I increase to say 15 secs?

 

[Mooly]

Try increasing C3 to a 68uF or 82uF but they need to be low leakage types. R6 charges the cap and defines the delay but leakage in the cap becomes dominant.

 

[SRMcGee]

Size R15, for 20-25ma through optocoupler

Monk55 (et. al.):

Yes, I saw that on the pcb but don't understand what it means. I'm looking for actual guidance on how to take the appropriate measurements.

Regards,
Scott