My version of LM4780

[Lamicz]

Hi all here! First I want to thanx all users in this gr8 forum, because I have selected LM 4780 as my new amp and it is really good . Let me explain - I was coming here only as a guest, but now I decided to register here as a regular user. I was thinking about it for a very long time, because my english is not very good and, mainly, I haven`t got much experience with audio, only beginner...
So, now to my amp:
In fact, I have 2 amps - one is geared by TDA7250 coupled with TIP132/137 Darlingtons. As I heared about very big problems with this amp, I have none for 2 years. But the chassis is small, so I had to use smaller trafo - only 2.5amps@20V symetrical. Also capacitors aren`t very big - 4x 4700uF, i.e. 2x 4700 per channel. Due to that "compromisses" sound is not very detailed, mainly on low freq.. So, nowadays I decided to build new amp and I choosed mentioned LM4780. I bought bigger box to properly fit with all needed components, which are:
- toroid trafo - 200VA/29V sym.
- rectifier bridge with 2x 10.000uF (1 per channel) and 15V sym. throught stabilizators for preamp
- 2x mono preamps with corrections based on NE5532
- input taken throught stereo 6.3 jack
- output - 4 banana jacks

improvements for future: kind of loudspeakers protection, fan or bigger heatsink (very, very small...), thinking of buying 2nd board for bridging, but have only 4Ohms speakers

Photos:

LM4780:



TDA7250:

[Crazy-Stereo]

Nice work! Very neat and tidy.

[wintermute]

welcome to the community lamicz

and I wouldn't be worried about your english at all!

Tony.

[Russ White]

Lamitz,

Nice work! I like your amps , you are doing just fine, its always nice to see new people! Your english is more than adequate.

Cheers!
Russ