3 Way Active Converter !!

dragonxwas · 22nd August 2011, 06:29 PM

Well guys,

I have finally decided to 3way active for my car.. So have decided to make a 3way Linkwitz riley crossover network using the diagram given at ESP..

now what I see there is the circuit is powered by +15v and -15v, Well for that again there are many other inverter designs out there, but what I am asking

is there any other way to make a simple inverter to get me out these voltages out of my cars 14.4v ?

I have thought to use the 555 Ic to generate wave and drive an push pull power transistor configuration , running a ferrite wound coil, but then I think what is the safety of this crude system ??

what are the precautions I have to take , my fear is that it shouldn't set my car on fire :P

but then are there any other ways to get these voltages rather than the regular ic controlled systems and the monostable configuration..

Perry Babin · 22nd August 2011, 07:01 PM

A transformer is the best solution since it gives you isolation from ground (no ground loops).

If you're going to use an IC, use either the TL494 or the SG3625.

Use a fuse on the input to the power supply and there won't be a fire hazard. A 3 amp fuse should be enough.

dragonxwas · 23rd August 2011, 08:37 AM

@ Perry, the god of car amps..

sir,

I understood ground loop problem, it happened in my current design of directly using an amp on 12v rail, had to use a input isolator..

but SG3625 seems to be too much complication, is there any other easy way, my power draw is no more than 100ma (max). all its going to power is 4 op-amps..

Perry Babin · 23rd August 2011, 08:40 AM

There's nothing complicated about the 3525. You don't even need driver transistors because it can drive the FETs directly. All you need is the IC a few timing components and the FETs to drive the transformer.

dragonxwas · 23rd August 2011, 08:44 AM

ok sir,
I go your way..Safety is main concern..

djQUAN · 23rd August 2011, 01:36 PM

you can use something like this to get the dual supplies easily.

DC-DC Converter Isolated Power In10V-16V Double Out 12V | eBay

22nd August 2011, 06:29 PM	#1
dragonxwas diyAudio Member Join Date: Feb 2010	3 Way Active Converter !! Well guys, I have finally decided to 3way active for my car.. So have decided to make a 3way Linkwitz riley crossover network using the diagram given at ESP.. now what I see there is the circuit is powered by +15v and -15v, Well for that again there are many other inverter designs out there, but what I am asking is there any other way to make a simple inverter to get me out these voltages out of my cars 14.4v ? I have thought to use the 555 Ic to generate wave and drive an push pull power transistor configuration , running a ferrite wound coil, but then I think what is the safety of this crude system ?? what are the precautions I have to take , my fear is that it shouldn't set my car on fire :P but then are there any other ways to get these voltages rather than the regular ic controlled systems and the monostable configuration..

22nd August 2011, 07:01 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	A transformer is the best solution since it gives you isolation from ground (no ground loops). If you're going to use an IC, use either the TL494 or the SG3625. Use a fuse on the input to the power supply and there won't be a fire hazard. A 3 amp fuse should be enough. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

23rd August 2011, 08:40 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There's nothing complicated about the 3525. You don't even need driver transistors because it can drive the FETs directly. All you need is the IC a few timing components and the FETs to drive the transformer. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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23rd August 2011, 08:37 AM	#3
dragonxwas diyAudio Member Join Date: Feb 2010	@ Perry, the god of car amps.. sir, I understood ground loop problem, it happened in my current design of directly using an amp on 12v rail, had to use a input isolator.. but SG3625 seems to be too much complication, is there any other easy way, my power draw is no more than 100ma (max). all its going to power is 4 op-amps..

23rd August 2011, 08:44 AM	#5
dragonxwas diyAudio Member Join Date: Feb 2010	ok sir, I go your way..Safety is main concern..

23rd August 2011, 01:36 PM	#6
djQUAN diyAudio Member Join Date: May 2004 Location: manila	you can use something like this to get the dual supplies easily. DC-DC Converter Isolated Power In10V-16V Double Out 12V \| eBay

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