Maker Pro
LM4702 ultra hifi audio amplifier

LM4702 ultra hifi audio amplifier

because i'm to broke to buy a marantz

Project Log

i'm still in high school, so don't expect much progress on this as i have a limited budget

so i'm making a hi-fi amp. i was browsing around digi key and i came across a lme49811 chip. i found out that the highs aren't really good, so i did more poking around digi key. then found this this LM4702B chip. i saw the specs were super good, and it used mosfet drivers, which means it has high wattage output. so here are the specs:
lm4702b:
.0003% thd
300 watt per channel
2 channels (you only really need two most of the time)
toshiba 2sk1530/2sj201 mosfets

then i found out how crappy the quality of most DACs and pre amps were, and how expensive the good ones were so i had to build that too (aw sh!t)
so here are the specs:
for the DAC i'll be using two chips
cs4398:
spdif/coax (pcm) to audio interface
32khz-192khz sample rate
cs8416:
dac
120db range
-107db (0.0004467%) thd+n

the pre amplifier will consist of a burr-brown OPA2134, i might not use this, or maybe select a different chip because that will cause too many stages in my amplifier, inducing lots of distortion.
opa2134:
.00008% thd+n
yeah, not much to see here.

while i'm at it, might as well make a super sensitive stage just for microphone input:
INA217:
.004% thd
1.2 nv sensitivity

any suggestions? comments?

Item information

Added by
swagguy8
Views
1,796
Last update

More in Project Logs

Share this item

Top