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Old 11th December 2010, 11:11 PM   #11
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That thermal overload device identified by Enrik (post 8) has to connect somewhere!
Click on that thumbnail. See the four yellow blocks, actually connectors ?
...We just can't positively identify what the device is; From the schematic, the arrow
suggests it might be a another subcircuit but practically it is probably just a thermistor,
thermal switch or other device.

Omitting that whole circuit connection should not affect normal operation as a DC sensor and delay.
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Last edited by Ian Finch; 11th December 2010 at 11:29 PM.
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Old 11th December 2010, 11:49 PM   #12
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Sorry, post 9 provides all necessary details for thermal overload sense.
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Old 12th December 2010, 01:02 AM   #13
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Default Power Amp Output Connection

How are these terminals get wired?

What is their purpose?
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File Type: jpg Speaker_protection_circuit_30A_connection.jpg (81.5 KB, 621 views)
File Type: jpg Pwr amp output conn.jpg (70.1 KB, 600 views)
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Old 12th December 2010, 09:27 AM   #14
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Is the notation on the circuit and circuit operation #8 and #9 not clear?
According to Nrik, L(eft) and R(ight) leads connect to the top (emitter side)
of the positive emitter resistors in your output stage - L and R channels respectively.
You must locate and make this connection yourself. The other side of the resistor is
the output (+) which is already connected.

It seems awkward but if you want a working safety overload switch, it must be
adjusted to the amp and transistor SOA characteristics anyway. This is not a 5
min. task unless you undershoot with a wide safety margin and just hope for the best.
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Old 9th March 2011, 06:04 AM   #15
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Quote:
Originally Posted by ppcblaster View Post
How are these terminals get wired?

What is their purpose?
I have assembled one of these kits and posed the same question to the supplier.

The terminals are 'specifically for solid-state push pull amplifier that has emitter degeneration resistors. Since not all amplifiers are of this architecture so we usually ask users to ignore it.'

I suggested to the supplier that the kit instructions include this information.
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Old 31st October 2011, 12:40 AM   #16
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Quote:
Originally Posted by Black Gate View Post
I have assembled one of these kits and posed the same question to the supplier.

The terminals are 'specifically for solid-state push pull amplifier that has emitter degeneration resistors. Since not all amplifiers are of this architecture so we usually ask users to ignore it.'

I suggested to the supplier that the kit instructions include this information.
so what do you think of this kit so far?
are they worth buying, Ebay, has a lot of them , Ebay link of one of them (30amp)
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

I also been looking at the this one (15amp)

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Elliott Sound Products (Amp?)
Loudspeaker Protection and Muting

looks like the K4701b are harder to find now (10amp)

I'm thinking of ordering some for my Phace Linear Amps 700 II or 400II
which can have thums when turing on & off, I like the 30amp rating

so what do people think of these newer kits?
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Old 14th January 2012, 02:23 PM   #17
rahkik is offline rahkik  India
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Default help!!!!.........

i need the pcb design of Speaker protection circuit 30A so pls send me its a request............
pls if u have so plzzzz send me...........have a nice day...
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