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Old 18th May 2007, 12:38 PM   #1
Risto80 is offline Risto80  Macedonia
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Default Please help / sub amp TIP35/35C

Hi

Please help me, I have search all diyaudio.com site and I dont find any schematic with pcb board using tip35/36C and supply for +/- 35 volts.
I like to use in car ampifier, so please help attach the files with schematic and pcb board

Thanks
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Old 18th May 2007, 12:58 PM   #2
AndrewT is offline AndrewT  Scotland
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What speaker impedance are you intending to drive?

4ohm will need a few parallel pairs in the output stage.
2ohm will need twice as many.
1ohm will require too many.

How about deleting the car audio posting?
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Old 18th May 2007, 01:01 PM   #3
AKN is offline AKN  Sweden
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Hi Risto80,

Take a look at this thread.
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Old 19th May 2007, 10:25 AM   #4
Risto80 is offline Risto80  Macedonia
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Default Hi

The amp is for car subwoofer sow the speaker mus be 4 ohm, and i like to use just one pair of tip35/36c
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Old 19th May 2007, 11:43 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
one pair of tip35c will struggle into an 8ohm load.
The DC SOAR limits output to 8ohm 45degree phase angle and Tc<=40degC. This means it can only drive a gentle speaker load if the heatsink is kept below 30degC.
Into 4ohm it is even worse allowing only 25degree phase angle.
The TIPs do not gain much for transient signal handling. Look at how close the 5mS is to the DC SOA.
You need 2pair for 8ohm loading at car temperatures and probably 3 or 4pair for 4ohm loading.
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Old 21st May 2007, 07:32 AM   #6
Risto80 is offline Risto80  Macedonia
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Default Hi

I heve seen lot of schematic who use one pair of output tranzistors less powerfull than tip35/36c and it work perfectly
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Old 21st May 2007, 08:27 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
there are many commercial manufacturers for whom this is a good specification
Quote:
This means it can only drive a gentle speaker load if the heatsink is kept below 30degC.
and the result is broken amps that need replacing very frequenctly, particularly if abused during a party. The manufacturers don't mind, as there are some other gullible buyers that keep replacing their gadgets every year anyway.

If one requires reliability then the conditions must be met or the devices doubled up.
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Old 21st May 2007, 09:52 AM   #8
Risto80 is offline Risto80  Macedonia
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Default hi

First of all I have kac-716 wich use one pair of 75w tranzistors and I use him with 12 subwoofer and it work perfectly 9 years,so if we use one pair of tip35/36 I think the amp will be good even if we use with 12 subwoofer.
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