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

[Joel Wesseling]

Thanks!
when I use online XLS converter to convert the BOM I didn't get the placements.
Mooly's dia is labelled Q6 but the transistor is actually Q4

 

[neric34]

Hi,
I have questions about Aleph J and speaker protector.

Are theses substitutions right :

• https://www.mouser.fr/ProductDetail/667-EEU-FC1H221 --> https://www.mouser.fr/ProductDetail/Panasonic/EEU-FC1H221B?qs=8Z%2BUzlV55zTBr2Yas7j9ow==
• https://www.mouser.fr/ProductDetail/Xicon/273-1K-RC?qs=M%2BIfXg%2ByqRVPlkjYlws/ZQ== --> https://www.mouser.fr/ProductDetail/KOA-Speer/MF1-2CCT52R1001F?qs=02bO81gVaTfXa/5uFhbh/A==
• https://www.mouser.fr/ProductDetail/Xicon/273-33K-RC?qs=xuCR%2BKn/5bseFcNby2yrkw== --> https://www.mouser.fr/ProductDetail...ronics/MFR4-33KFI?qs=yhV1fb9g/KbOgUtO0W71ig==
• https://www.mouser.fr/ProductDetail/Xicon/273-470-RC?qs=64PH99Wi09/BRhFeS6tqNw== --> https://www.mouser.fr/ProductDetail/KOA-Speer/MF1-2CCT52R4700F?qs=02bO81gVaTf4zNPozZ46NA==
• https://www.mouser.fr/ProductDetail/Xicon/273-150K-RC?qs=9B6tJshR4pRLM/IoBZ5G7Q== --> https://www.mouser.fr/ProductDetail/KOA-Speer/MF1-2CCT52R1503F?qs=02bO81gVaTd28xazBAS1EA%3D%3D
• https://www.mouser.fr/ProductDetail/Xicon/273-10K-RC?qs=52SUUWvJF5Uxqs8qMHgtUQ== --> https://www.mouser.fr/ProductDetail/KOA-Speer/MF1-2CC1002F?qs=klP8Go34dYHImTTFOFDDKw==
• https://www.mouser.fr/ProductDetail/onsemi-Fairchild/1N4004?qs=ZbYWOjW8mGpRbRDWUVHnvw== --> https://www.mouser.fr/ProductDetail/onsemi/1N4004G?qs=y2kkmE52mdNg%2Biqv0rMpBA==
• https://www.mouser.fr/ProductDetail/Omron-Electronics/G5LA-14-CF-DC5?qs=dLWB/tR6aAZ1eRKXXYI8IQ== --> https://www.mouser.fr/ProductDetail/Omron-Electronics/G5LE-1-DC5?qs=ImaqFqjHA4nKN7ETIjn3Lg==

What kind of power transformer is needed for the speaker protector ? (12VAC) I need 230V one.

Thanks for help. If you have advices...

 

[neric34]

Hi,
To power the speaker protection board for an Aleph J, can I plug this board directly into the 500VA/18V transformer?
Or is it better to have an other transformer ?

Thanks.

 

[SRMcGee]

neric34:

You can connect the speaker protection board directly to your transformer. I believe the two relays on the speaker protection board are in series, so you would need 12VDC relays.

Regards,
Scott

 

[neric34]

Thank you.
Do you think speaker protector circuit is necessary for an Aleph J ? Certains say it's not... I don't know...

 

[SRMcGee]

If you have the speaker protection board and room to install it, use it. It doesn't cost very much to populate, is reliable and can save you a lot of agony.

 

[tesla005]

Is it possible to use the board with a 15VAC supply? I'm planning to use an unused secondary of one of the 2 power transformers (AN-4445) used in my Honey Badger project. What voltage must the relays be rated for? Maybe 6 or 9 VDC? Also, given that the power transformers are connected to the soft start board, the voltage on the 15VAC secondary will presumably rise slower. Will this pose a problem for the delay circuitry?

 

[tesla005]

Also, is this relay a suitable alternative: 833H-1C-C-12VDC?
The solder pin spacing seems to be identical to the Omron.

 

[SRMcGee]

tesla005:

I'm no expert, so take my thoughts with a grain of salt. 15VAC once rectified will be about 21VDC, minus diode losses of about 1V, or 20VDC. The two relays on the speaker protection board are in series. The relay you specified has a pick-up voltage of 75%, which I believe means the two relays should activate when they see a total of 18VDC. I believe you'd be fine with two 12VDC relays. That said, maybe use a 12VDC relay and a 9VDC relay instead?

Regards.

 

[hcpower]

Can I skip the "LED2" pr schematic and replace with a standard 1N4004 diode without further adjustments.
Im not that much into several power-indicators in my amplifier

Regards

 

[Eslheadphone]

Just delete Led 2 and R14. No need to replace the Led with a diode.

 

[fackamato]

Sorry if this has been answered already. Is this compatible with class D amps such as TPA3255 where the GND between left and right CANNOT be shared?

 

[misterGI]

I'm not sure this is the case, but to implement a dual mono configuration, where left and right grounds are separated, I used two boards.

 

[Chiptech]

Ok. Turned things on. Lights are solid. But when I measure for resistance, I get 0.2 ohm for both speaker channels. Good enough or something amiss?

I don't have any speaker wire connected.

 

[Mooly]

If you mean 0.2 ohms from amp in to speaker out then yes, it is going to be normal. Have you accounted for your meter lead resistance ?

 

[Domdas]

Hello , I have question about proper speaker protection board connection. I have 33+- VDC psu and separate 12 V transformator to feed SPBoard. Please check my connections . Brown and blue 12VAC , yellow ground PSu. in this configuration delay works good, but i am not sure if dc protection is also ok. i made test with 1,5V battery ( battery '+" to IN on board nad battery "-" to chassis. relay did not disconnect speakers .

 

[Mooly]

1.5 volts is not really enough to trip the protection (and in practice would not damage a speaker either). You need above around 2.5 volts for a trip.

 

[esprit]

hello
For rely, can I use 635-G5LE-1-E-DC12.
This is for mono use with 12v transformer.

 

[Mooly]

It looks OK, 12v coil and 16amp rating. Should be fine.

 

[neric34]

Hi,
I am starting the construction of my Aleph J. Could you tell me if the HP protection circuit is connected correctly, please?