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Chip Amps Amplifiers based on integrated circuits

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Old 28th September 2003, 04:17 PM   #31
mcp is offline mcp  United States
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Car amplifiers run off a car battery which is 12Vdc. For this amplifier to work in a car, it will need a switch mode convertor to change the 12Vdc to +-Vs for the amp.
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Old 29th September 2003, 07:28 AM   #32
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Read the posts carefully...he has already built a SMPSU to run the amp...
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Old 29th September 2003, 08:33 AM   #33
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Quote:
Originally posted by li_gangyi

Read the posts carefully...
It would be wise of you to read my post carefully too.

Would you explain to me where the power darlingtons are?
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Old 29th September 2003, 08:40 AM   #34
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Quote:
As Q1 and Q2 i've used TIP142/147 that should be enough to have 70W+
Read again...it's at Q1 and Q2...probably he used the wrong symbol...that's why you got a bit messed up..looks like a little argument btw me and you here...hehe...2 Singaporeans...
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Old 29th September 2003, 09:06 AM   #35
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You have a lot to learn about amplifiers.
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Old 29th September 2003, 10:19 AM   #36
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He could have been aiming for more output current or something...that's why he place another pair there...or maybe he doesn't know what he is doing...no matter what..I still think his SMPSU has a problem...what do you think?? And yes...I do have a lot to learn about amps...
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Old 29th September 2003, 10:37 AM   #37
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Anyways...the TIP142s and TIP147s are reccommended by the manufacturer...I have posted a short segment of the PDF (datasheet) here...hope you can download the datasheet and look through it before trying to post again..seems like wrong information might mess up this guy...hehehe
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Old 29th September 2003, 01:21 PM   #38
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Default 2 ways to use TDA7250

You will find that on page 6 of the application notes is "Figure 1 - Application Circuit with Power Darlingtons" whereas on page 9 is "Application Circuit using Power Transistors".

Please note that these 2 circuits are not the same.

Page 6 uses Darlington Outputs (TIP147/142) for Q1, Q2, Q3, Q4.

Page 9 circuit use drivers Q1, Q2 to drive output transistors BD912/911 which are configured as a Sziklai Compound Pair.
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Old 29th September 2003, 01:56 PM   #39
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Ok to clear some stuff...Maxis...you CAN continue to use the TIPs...but you have to edit your layout slightly...here's the schematic...
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Old 29th September 2003, 01:58 PM   #40
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By the way...you should be using a more powerful...higher current power supply input for your SMPSU...1.5A is NOT enough for it...due to the fact that it is stepped up...it would drop to under an amp...and also sorry to MCP for not being really clear...and yeah...the TIPs should be at Q1, Q2, Q3 and Q4...
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