I am just starting to learn about car amps and would like to see what various manufacturers have done in terms of board layout, components, and general construction.
Well, I have an old Advent PA250 which is a 2x50W bridgeable amp. It uses one KTD718 NPN and one KTB688 PNP for each channel. Switching mosfets are IRFZ34 and the PWM generator is the TL494, which I am finding is a fairly common unit. The rectifier is two independent TO-220 chips which I can't find anything about. The package says 2502n and 2502c for the other. Each has an independent heatsink and is not connected to the main sink. There are two NJM4558 opamps sitting next to the bridge switch and input sensitivity pot, but I haven't looked at what they are doing yet. I don't know much about the transformer and don't have any test equipment around to check voltages.
The bottom of the board is full of thick traces with lots of solder on wach trace, which I assume increases current capacity. There are no plated vias, just holes, and the top of the board has jumper wires to the other side.
Like I said, I am still learning, and it would be nice to see what other amps look like, as I would eventually like to build one. If this takes off, I will go pull the punch 400x4 out of the truck and snap a few shots of it.
Well, I have an old Advent PA250 which is a 2x50W bridgeable amp. It uses one KTD718 NPN and one KTB688 PNP for each channel. Switching mosfets are IRFZ34 and the PWM generator is the TL494, which I am finding is a fairly common unit. The rectifier is two independent TO-220 chips which I can't find anything about. The package says 2502n and 2502c for the other. Each has an independent heatsink and is not connected to the main sink. There are two NJM4558 opamps sitting next to the bridge switch and input sensitivity pot, but I haven't looked at what they are doing yet. I don't know much about the transformer and don't have any test equipment around to check voltages.
The bottom of the board is full of thick traces with lots of solder on wach trace, which I assume increases current capacity. There are no plated vias, just holes, and the top of the board has jumper wires to the other side.
Like I said, I am still learning, and it would be nice to see what other amps look like, as I would eventually like to build one. If this takes off, I will go pull the punch 400x4 out of the truck and snap a few shots of it.
Attachments
I open pretty much everything that comes into my posession. Anyway.....
someone blew up this gut
power precision
PPI-2150M
i am a noob to amp... period!!!
switchers: IRfz34
________: 2n6487 and 2n6490
^^dont know what it is
and still a noob. broken amp
power precision
PPI-2150M
i am a noob to amp... period!!!
switchers: IRfz34
________: 2n6487 and 2n6490
^^dont know what it is
and still a noob. broken amp
An externally hosted image should be here but it was not working when we last tested it.
Wow, the layout on the QX4150 is nice. Is there any SMPS that does not use the IRFZ44 or 34?
Looks to me like the emitter resistor on the far right is cooked. Indicative of a shorted output device? Just a guess...
Looks to me like the emitter resistor on the far right is cooked. Indicative of a shorted output device? Just a guess...
do diy car amps count?
www.djquan.angelcities.com/amplifiers2.html
also, two test reports showing insides of the amps.........
http://caraudiomag.com/testreports/0308cae_xtant/
http://caraudiomag.com/testreports/0311cae_trutech/
www.djquan.angelcities.com/amplifiers2.html
also, two test reports showing insides of the amps.........
http://caraudiomag.com/testreports/0308cae_xtant/
http://caraudiomag.com/testreports/0311cae_trutech/
djQUAN said:
That Trutech one is a beauty!
Wima caps and BB opamps:
An externally hosted image should be here but it was not working when we last tested it.
ESX Q120.4
US Acousics 800F (Zed made)
An externally hosted image should be here but it was not working when we last tested it.
US Acousics 800F (Zed made)
An externally hosted image should be here but it was not working when we last tested it.
here is a true Audiophile Amp
Here is a beauty you don't see, check it out. AMAZING build and sound quality to compare only to high end home amps.
Here is a beauty you don't see, check it out. AMAZING build and sound quality to compare only to high end home amps.
profuse007 wrote:
PPI used 2n648x/2n649x for the output transistors. The only mosfets were in the power supply.
Tim
PPI used 2n648x/2n649x for the output transistors. The only mosfets were in the power supply.
Tim
I just got this PPI Tube Driver Amplifier. I am not sure if its a TD275, TD2150, or TD1250. Anyone know which it is?
Check out the pics here:
http://photos.yahoo.com/tariq_azhar
Check out the pics here:
http://photos.yahoo.com/tariq_azhar
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