UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

TonyDuell · 17th May 2019, 4:28 pm

I don't know hat you call 'reasonable' but RS sell the Texas Instruments version (UA723) at
£2.01 each here :

https://uk.rs-online.com/web/p/linea...ators/1266368/

or a tube of 25 for £10.20 here :

https://uk.rs-online.com/web/p/linea...ators/1450100/

(both prices exclusive of VAT).

The '723' is an old and well-known regulator IC. Really a regulator building block kit

. There's a reference voltage source, an op-amp and an output transistor in there. You can link it to external transistors to increase the current capacity. You can use it (as you might expect) as a linear regulator, or you can get the op-amp to oscillate and use it as a switching regulator (as DEC and HP did over 45 years ago).

17th May 2019, 4:28 pm	#5
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,213	Re: Raycom Ltd Bench PSU CB524 I don't know hat you call 'reasonable' but RS sell the Texas Instruments version (UA723) at £2.01 each here : https://uk.rs-online.com/web/p/linea...ators/1266368/ or a tube of 25 for £10.20 here : https://uk.rs-online.com/web/p/linea...ators/1450100/ (both prices exclusive of VAT). The '723' is an old and well-known regulator IC. Really a regulator building block kit . There's a reference voltage source, an op-amp and an output transistor in there. You can link it to external transistors to increase the current capacity. You can use it (as you might expect) as a linear regulator, or you can get the op-amp to oscillate and use it as a switching regulator (as DEC and HP did over 45 years ago).