I few years ago when I first started experimenting with chipamps I threw together a amplifier based on the LM1875 out of spare parts and connected it to a PC and an old NEC SCSI CD-Rom. It has gotten used everyday. Occasionally I get the urge to open it up and tweak something. It has received a new pot, input jacks, power supply, etc. Then one day it dawned on me to take it one step further.
For the first time I started playing with Eagle and decided to design some pcbs for the LM1875. Inspiration came from Peter and Brian's original LM3875 boards. I found a place online that quickly made some prototype boards for cheap. I learned a lot and I'm happy with the results. The sound is clear and noise free.
This is a picture of the original amp.
For the first time I started playing with Eagle and decided to design some pcbs for the LM1875. Inspiration came from Peter and Brian's original LM3875 boards. I found a place online that quickly made some prototype boards for cheap. I learned a lot and I'm happy with the results. The sound is clear and noise free.
This is a picture of the original amp.
Attachments
Not bad, Ive always found making PCB's fun yet frustrating at times. Glad it worked out for you
Dave
Dave
Looks very good. I personally like using the p2p method for 1875s, actually all chip amps I've done.
How does it sound?
How does it sound?
Thanks,
The boards cost $50 shipped for 8 amp channels and 4 power supplies. No solder mask, no silkscreen. I received them in one week after placing the order. Not near the quality of the boards that I received from Audiosector, but for a prototype, its better than I expected.
The amp sounds good. It runs off +-20volt rails so I am looking at about 17 watts per channel. The highs are clear, and the lows are present. Its dead quiet.
I now need to think of a small bookshelf fullrange speaker to go with it.
The boards cost $50 shipped for 8 amp channels and 4 power supplies. No solder mask, no silkscreen. I received them in one week after placing the order. Not near the quality of the boards that I received from Audiosector, but for a prototype, its better than I expected.
The amp sounds good. It runs off +-20volt rails so I am looking at about 17 watts per channel. The highs are clear, and the lows are present. Its dead quiet.
I now need to think of a small bookshelf fullrange speaker to go with it.
Attachments
Would you mind sharing with us the company that manufactured the boards for you? Pretty Please 😀
Dave
Dave
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