Please share the total cost if possible.
Regards,
Sachin
Do you hear a difference in HF with and without ferrite beads?
They supposedly reduce frequency extension at the top.
--G0bble
Nicely done omishra,
vivek
this datasheeet says 100W into 4ohms
http://www.datasheetcatalog.org/datasheet/Tripath/mXyzxwwu.pdf
That's a really nice piece of DIY amp.
I have one question though. These famous Chinese Topping amps use the same chip and just manage to churn out 7watts of power (@4ohm load). So how come these 41hz chips manages to extract 100watts of power from the same chip? Are they used in the bridged configuration? or is it because of that beefy power supply?
I think he might be talking about changing resistors which are used to sense under/over voltage cut. These need to chosen in accordance with PS voltage. These setting are hardwired with some resistor values. For more output more voltage (of course speaker impedance matters) will be required within limits of chip. My amp planned for +-33V mutes at below 27V and above 34V. same thing will be different for using it at +-40V.Vivek
I am not sure how can you exceed the power rating of the chip by changing the resistors/caps
Thanks again!
It's not bridged, playing in stereo mode. I suspect the Chini Bandhu's
It's max output is dependent on power supply rating. It operates from +-12 to +-40 VDC. I am using it with PS of +-33VDC, approx 6A capacity. So I could drive max ~70Watt/ch in my WF D 9.2 speakers with 6 ohm impedance. Still its huge inside house.
Few things I could say about this layout is -
- Low level signal is away at opposite corner of main power supply.
- Signal paths are not crossing noisy power lines.
- Toroidal transformer, Controller, warning buzzer and speaker protection relay are separated from amp board using metal sheet. See two compartments.
- For controller board, I wound 48+48 turns of 24SWG enameled wire on transformer to get 12-0-12 for relay and other small power requirements.
- Power supply uses two parallel bridge rectifiers and set of caps. This is to minimize diode resistance and less heat dissipation in PS.
- Chassis as heat sink.
- To avoid drilling in Chassis I used that meshed bottom plate (bought for Rs 10 from scrap vendor). It is fixed using 4 bolts of chassis feet itself. So no extra hole at chassis bottom.
Vivek
I am not sure how can you exceed the power rating of the chip by changing the resistors/caps
if you want more than 100w then go for bridge , but only 8ohm load, it can give 150w
I think he might be talking about changing resistors which are used to sense under/over voltage cut. These need to chosen in accordance with PS voltage. These setting are hardwired with some resistor values. For more output more voltage (of course speaker impedance matters) will be required within limits of chip. My amp planned for +-33V mutes at below 27V and above 34V. same thing will be different for using it at +-40V.
+1, truly a class act. And the volume knob is made by you too....Kudos!!The enclosure looks classy !!!!!