Boots Audio 3000

[kirstyd]

Hi all .Just want to know if its possible to get a replacement for this.If not would something else do .The numbers on it are 76023-37P

[Cobaltblue]

Hi Kirsty its a relatively common Audio IC

One Here

https://www.ebay.co.uk/itm/SN76023N-...QAAOSwUKxYaOF~

You can find them cheaper if you have a bit of a search

Cheers

Mike T

[kirstyd]

Thanks Mike
Its from a cheap boots audio record player .Shorted speaker leads have fried the IC
Cheers Kirsty

[G6Tanuki]

Those Texas Instruments 76xxx-series audio amps are known for their unreliability! Truly horrid things, which - like sheep - would regularly die for no reason at all, purely out of spite. But if needs must, replace like with like.

Check the supply-rail voltage before you fit the replacement, they don't handle living-with-high-HT at all well. Same goes for any inadvertent short on the speaker-wires.

[kirstyd]

Thanks guys
The other channel is working perfectly and i have repaired the faulty speaker plugs [replaced both with new ones]I will take your advice and replace the unit .As a matter of interest whats in it ? .I see the four sets of three connections and assume theres four transistors in there [or is that too simple]If so can i test them in the usual way?

[G6Tanuki]

The finned "thing" is a complete audio-amplifier-on-a-chip; there's a lot more than 4 transistors in there [plenty of resistors and bias-regulation diodes as well]

The insides of the SN76xxxN series are supposedly similar to the "Sinclair IC-12" chip - which also has similarities with a chip-series by Plessey [SL4xx range] - some claim that the Sinclair chips were actually 'regraded' rejects from the Texas Instruments or Plessey production-lines

See http://www.angelfire.com/sd/paulkemble/sound5d.html

[paulsherwin]

You could just replace the entire audio amp with one of the 99p Chinese modules.

[kirstyd]

hmm quite a complicated bit of technology then .The Chinese module sounds interesting .can you recommend a suitable one for the job/ it might work out cheaper to fit one of those

[paulsherwin]

There are loads of them on eBay if you search, mostly using the LM386, TDA2030 or PAM8403. The choice will probably come down to the supply voltage available and how much output power you need.

[unitaudio]

If you use a TDA2030 you could end up with a wolf in sheep's clothing! I have an amp here based around this chip which I use with my computer, playing into a pair of fairly decent Philips mini system speakers. The amp is capable of putting out 20 watts RMS into 4 ohms. Needs a fairly hefty power supply for such strenuous work however, 12v and at least 4A.

I quite like the idea of a hot-rodded Boots Audio record player! Some beefier speakers might be a good idea though...

Regards,
Paul

[John123]

A TDA7297 solution is another one to consider. Seen plenty of kits floating around here 'n' there, although I've never had a go at building one myself!

Some of the newer Class D digital amplifier kits appear to have additional Bluetooth functionality built-in, which can serve as an interesting way of bringing something up-to-date in a discreet, inconspicuous fashion. They also tend to run much cooler which is a plus if cabinet space or ventilation is an issue.

A good kit build video can be found here.

[kirstyd]

lets see how i get on with the old amp first but this may be the way to go
thanks guys

[kirstyd]

Hi all
Well the new chip arrived today so its time to fit the thing now i have spent the last few days reading everything i can find on these things so i know its not a good idea to touch it or put a hot soldering iron near it but any other tips will be most welcome .I have been carefully comparing the new one with the old using a magnifying glass and for the life of me i cannot see any thing on the new one that donates which way round it should go .I put the black tape on the old one just for that purpose As you can see in the photos the old one has that little half moon indentation on one end the new one has not .Any ideas guys? .Could that be it on the opposite side in the last photo ?

[AC/HL]

Yes, That's it.
Don't worry about handling or soldering, it's not sensitive to either of these. G6 listed the main weaknesses of these early generation ICs in post 4.

Originally Posted by kirstyd

As a matter of interest whats in it ?. I see the four sets of three connections and assume theres four transistors in there [or is that too simple]If so can i test them in the usual way?

The Sinclair IC12 is reputedly a version of this, scroll down here: http://www.angelfire.com/sd/paulkemble/sound5d.html

Later generations overcame many of the limitations of these pioneers.

[kirstyd]

Thank Bill
will get on with it tomorrow.Thanks for the quick reply
KirstyD