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Old 15th July 2005, 01:36 PM   #1
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Default "El Guapo" my silly TA8251AH project

I have no particular reason for building this amp other that I have about 10 of these chips I picked up in a lot I baught off ebay.

I need some help from those who might understand the datasheet better than I.

I have never seen this chip before, and I am a little puzzled by the mute and stby pins, and how to implement them. I also could use some advice on the output part (zobel values and such).

Here is the datasheet:
toshiba datasheet

And here is my design so far:
Click the image to open in full size.

Click the image to open in full size.
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Old 15th July 2005, 02:37 PM   #2
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Mute control:
Pin 25 of chip must be pulled up with a resistor (5...10 k) to positive voltage. Then with a transistor you have to switch pin 25 as shown in page 5 of the datasheet. If the transistor gets active high on its base he will mute the circuit.

Michael
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Old 15th July 2005, 02:42 PM   #3
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Standby control:

same as mute but reversed: pin 2 has to be pulled DOWN with a resistor and if pin 2 gets high, amp will go into standby (page 3 of datasheet)

Michael
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Old 15th July 2005, 02:42 PM   #4
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Quote:
Originally posted by slackman
Mute control:
Pin 25 of chip must be pulled up with a resistor (5...10 k) to positive voltage. Then with a transistor you have to switch pin 25 as shown in page 5 of the datasheet. If the transistor gets active high on its base he will mute the circuit.

Michael

Ok, I am not sure I understand how that works, but If I want it never to be muted, can I simply put a 10K resistor between VCC and pin 25? Also, do I need to do anything with pins 1(SMOOTHING) and 10(RIP).
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Old 15th July 2005, 02:48 PM   #5
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Quote:
Originally posted by slackman
Standby control:

same as mute but reversed: pin 2 has to be pulled DOWN with a resistor and if pin 2 gets high, amp will go into standby (page 3 of datasheet)

Michael
Are you sure about that? I read it as it needs to be pulled up for "on" and down for "off/stby" , so if I had it connect to gnd the amp is in stby and if it is connected to V+ it is on.
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Old 15th July 2005, 02:52 PM   #6
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aaaah! Error!
Sorry: '...must NOT be pulled up'

for never mute leave the mute pin unswitched, for mute switch it to low.
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Old 15th July 2005, 02:55 PM   #7
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and yes... your'e right with standby: low is out and high is on - silly me.
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Old 15th July 2005, 02:56 PM   #8
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Quote:
Originally posted by slackman
aaaah! Error!
Sorry: '...must NOT be pulled up'

for never mute leave the mute pin unswitched, for mute switch it to low.

So for never mute do you think I can simply leave pin25 connected to nothing (neither pulled up or down)?
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Old 15th July 2005, 03:14 PM   #9
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yepp!
(see page 7, note on the lower end of the page)

Michael
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Old 15th July 2005, 03:17 PM   #10
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Quote:
Originally posted by slackman
yepp!
(see page 7, note on the lower end of the page)

Michael

Ahhh! great! So I imagine then I should also leave pin 1 open too.

Now I wish I knew what to do with pin 10.
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