UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits


Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Closed Thread
Thread Tools
Old 24th Dec 2013, 6:33 pm   #1
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,447
Default SGS-ATES TBA820 audio IC

Some may think it horribly modern, but this afternoon I've been re-acquainting myself with the abilities of the late-1970s SGS-ATES TBA820 audio-IC.

Back then there were essentially two players in the audio-power game - SGS-ATES [an Italian-American joint venture] with the TBA800/TBA810AS/TBA820 chips, and Texas Instruments with their finny SN76013-series.

[I refuse to acknowledge the Sinclair Super-IC12 here]

The TBA820 was a humble 16-pin-DIL-package with no finny heatsink or fat tabs to disperse heat into the copper of the PCB. It generally came with the pins 'staggered' but today's instance had the pins in-line.

Shoved into a turned-pin RS-components DIL socket soldered to some Veroboard, using the standard SGS-ATES circuit from the 1980s - 15V supply, 8 ohm speaker, it sounds rather good.

[Note: the 8-pin DIL "TBA820M" is a much lower-power 8-pin animal which I'm not going to get involved with].
G6Tanuki is offline  
Old 26th Dec 2013, 12:00 am   #2
Rest in Peace
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
Default Re: SGS-ATES TBA820 audio IC

I would agree the 820 is a useful audio chip, and have incorporated them in a few recent projects over the more usual LM386. They require more external components but produce good results at least for communications receivers. I started using them as I was given a load of the 8 pin version and found they produce more than enough audio power for general listening.
Biggles is offline  
Old 26th Dec 2013, 4:55 am   #3
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: SGS-ATES TBA820 audio IC

The TBA820M is good for a full watt into 8Ω, as opposed to 325 mW for the LM386., but it does require more in the way of passives around it. I used one as the headphone amp in my homebrew disco, a job it was was more than up to. I also bought a Spectrum add-on amplifier --- a neat little unit built up into an MB3 plastic box with an input for the Spectrum's PSU, daisy-chain lead to plug into the Spectrum's power inlet
and mic and earphone leads for the cassette player, volume control and a switch to select off / SAVE / LOAD / amplifier. This also was based around a TBA820M, and seemed to have been etched and built in someone's shed -- they clearly had a bit of a cottage industry going. By the time I outgrew my Spectrum, the monitor I was using with my Amiga computer had only mono sound; so I used the Spectrum add-on amplifier (with suitably modified leads) for the other channel à la Hacker AL42.

One of the variants of this IC (TBA810P?) was on a modified 14-pn lead frame with the three central pins on each side -- all at substrate potential -- replaced by broad copper tabs which could be soldered to a copper heatsink.
If I have seen further than others, it is because I was standing on a pile of failed experiments.
julie_m is offline  
Old 26th Dec 2013, 9:36 am   #4
mole42uk's Avatar
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,539
Default Re: SGS-ATES TBA820 audio IC

I looked at the data sheet, but I can't find which pins to connect the heater supply.

mole42uk is offline  
Old 26th Dec 2013, 10:39 am   #5
arjoll's Avatar
Join Date: May 2006
Location: Invercargill, New Zealand
Posts: 3,375
Default Re: SGS-ATES TBA820 audio IC

Not a chip I'm familiar with. As a teenager in the 80's I played a little with the LM386 but never had much luck - the LM380 was a different story though, virtually indestructible and they could make some noise!
arjoll is offline  
Old 26th Dec 2013, 12:17 pm   #6
Humber888's Avatar
Join Date: Jul 2012
Location: Bromley, London, UK.
Posts: 698
Default Re: SGS-ATES TBA820 audio IC

Originally Posted by G6Tanuki View Post
[I refuse to acknowledge the Sinclair Super-IC12 here]
The Sinclair IC was actually made by Plessey and rebranded and rerated to 12W by Sinclair. But this was none of your namby-pamby RMS Watts - more like peak power into minimum Ohms on a leap-Tuesday. The real IC rating for the Plessey SL404 (or a number something like that) was about 3W. I remember the Plessey Semiconductors rep, back in the '70s or '80s, telling me they were indebted to Sinclair for finding a real wear-out mechanism in that IC. Apparently, at high power, one of the internal substrate metallisations gradually eroded/migrated, due to high current flow, until it ruptured. This did not happen at Plessey's rated power output.

Humber888 is offline  
Old 26th Dec 2013, 12:26 pm   #7
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,086
Default Re: SGS-ATES TBA820 audio IC

Am I right in thinking that there was a TBA810H as well? If it's the IC I'm thinking of I have a dim memory of the 'H' being rather important when replacements were being sought - possibly a higher Vcc capability than the standard device?
SiriusHardware is offline  
Closed Thread

Thread Tools

All times are GMT +1. The time now is 10:07 pm.

All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at
Failure to heed this warning may result in death or serious injury to yourself and/or others.

Powered by vBulletin®
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.