Attachments
Last edited:
More pics in the other thread link provided. Didn’t want to load pics here as well.
One of my first Amps
Inspired by Flappy's recent "oldie" post. Here's one of my first amp projects built in the early 70's. It's a mono integrated 18 watt amp based on the Signetics NE540L driver IC. The amp circuit came from a Popular Electronics magazine article from May 1971. Technically, it's not a pure Chip Amp since the 540 drives the two discrete bipolar transistors seen on the back. The pre-amp is a three transistor circuit that came from a book of projects. I had to buy a few of the parts but most were scrounged from junk TV chassis and the like, which explains all the odd sizes.
I made the case and brass knobs in metal shop at school.
Didn't even know this was still around until I was cleaning out my dad's basement one day. This is the project that started it all and led to a life long career in electronics. Not only that, the thing still works. Thanks for looking. Anyone else got one?
Inspired by Flappy's recent "oldie" post. Here's one of my first amp projects built in the early 70's. It's a mono integrated 18 watt amp based on the Signetics NE540L driver IC. The amp circuit came from a Popular Electronics magazine article from May 1971. Technically, it's not a pure Chip Amp since the 540 drives the two discrete bipolar transistors seen on the back. The pre-amp is a three transistor circuit that came from a book of projects. I had to buy a few of the parts but most were scrounged from junk TV chassis and the like, which explains all the odd sizes.
I made the case and brass knobs in metal shop at school.
Didn't even know this was still around until I was cleaning out my dad's basement one day. This is the project that started it all and led to a life long career in electronics. Not only that, the thing still works. Thanks for looking. Anyone else got one?
Attachments
Thanks Jay. Started it at 14, in a different chassis and finished like this at 16. This was my sound system, along with a cassette deck and homemade speaker, until I finished college.
here is one pic of the inside, pretty basic... I gave this amp to my nephew ~10 years ago (kind of regret it)..
Attachments
Good catch! I had that in my mind while installing RCA's and I still made that mistake 🙂
Thanks for pointing that out!!
If you decide to change them I would recommend twisting the speaker leads too. Reduce the loop area as much as possible.
But beautiful layout and design!
But beautiful layout and design!
My very prototype style of build ... this my 4th working listening amp/pre-amp.
Bridged TDA2030 for sub and a single TDA2030 for mono-mix mid/top. To be upgraded to stereo in future.
Bridged TDA2030 for sub and a single TDA2030 for mono-mix mid/top. To be upgraded to stereo in future.
