"El Guapo" my silly TA8251AH project

Russ White · 15th July 2005, 01:36 PM

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:

slackman · 15th July 2005, 02:37 PM

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

slackman · 15th July 2005, 02:42 PM

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

Russ White · 15th July 2005, 02:42 PM

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).

Russ White · 15th July 2005, 02:48 PM

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.

slackman · 15th July 2005, 02:52 PM

aaaah! Error!
Sorry: '...must NOT be pulled up'

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

slackman · 15th July 2005, 02:55 PM

and yes... your'e right with standby: low is out and high is on - silly me.

Russ White · 15th July 2005, 02:56 PM

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)?

slackman · 15th July 2005, 03:14 PM

yepp!
(see page 7, note on the lower end of the page)

Michael

Russ White · 15th July 2005, 03:17 PM

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.

15th July 2005, 01:36 PM	#1
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	"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: __________________ Less pulp more juice Twisted Pear Audio.

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15th July 2005, 02:37 PM	#2
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	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

15th July 2005, 02:42 PM	#3
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	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

15th July 2005, 02:52 PM	#6
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	aaaah! Error! Sorry: '...must NOT be pulled up' for never mute leave the mute pin unswitched, for mute switch it to low.

15th July 2005, 02:55 PM	#7
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	and yes... your'e right with standby: low is out and high is on - silly me.

15th July 2005, 03:14 PM	#9
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	yepp! (see page 7, note on the lower end of the page) Michael

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