rogerguzzi Posted April 24 Share Posted April 24 Hello Learned Friends I said I would convert one for a mate for his TR4 that is negative earth. I did my own on Spitty years ago and it works fine but the old Brain has Faded a bit since then and I can not find any notes? So is a L7810CV ok(I have several) with the 12v on the in leg(1) and 10v out leg (3) and leg (2) earth and the the tag? Some of the circuits show 0.33uf on leg 1 and 0.1uf on leg 3 ? I do not remember fitting these to mine? So how important are they? Roger (brain Fade!) Link to comment Share on other sites More sharing options...
DeTRacted Posted April 24 Share Posted April 24 (edited) The capacitors are not crucial in this application Roger - the one on the output gives better transient response if the load changes suddenly - which it won't. The one on the input helps with noise rejection but the instruments won't care much about a bit of noise on the output. After all, the original bimetallic 'stabiliser' was switching on and off all the time. Edited April 24 by DeTRacted 1 Link to comment Share on other sites More sharing options...
RedRooster Posted April 25 Share Posted April 25 Are you fitting it in the original housing? Link to comment Share on other sites More sharing options...
RogerH Posted April 25 Share Posted April 25 On the USA TRiumph Experience forum there was a concern that the LM7810 with 12V going in may not give the 10V coming out. However there would normally be something like 13V going in which should be enough. Go for it Roger Roger Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 25 Author Share Posted April 25 3 hours ago, RedRooster said: Are you fitting it in the original housing? Hello Yes then he can just swop them over and hopefully the gauges will read better? Roger Link to comment Share on other sites More sharing options...
Martin Posted April 25 Share Posted April 25 I use the LM7810 since years. No problems. Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 25 Author Share Posted April 25 3 hours ago, Martin said: I use the LM7810 since years. No problems. Hello Martin I think it must be a LM7810 in my Spitfire as I found 4 of them in the electronics boxes? It must have been in there for at least 8 to 10 years I think? Roger Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 25 Author Share Posted April 25 8 hours ago, RogerH said: On the USA TRiumph Experience forum there was a concern that the LM7810 with 12V going in may not give the 10V coming out. However there would normally be something like 13V going in which should be enough. Go for it Roger Roger Hello Roger I have built it in to the smiths case and I tested it on a variable power supply I turned it down to 11.5volts and it still gave 10.15volts and the same at 12v ,13v No load but I do not suppose they draw much power ? Roger Link to comment Share on other sites More sharing options...
Escadrille Ecosse Posted April 25 Share Posted April 25 (edited) Curious as to why you wouldn't just buy a negative earth one for a TR5/6 (visually idential) and save the hassle However out interest I did a search and found this link which replaces the original mechanical bimetallic innards with a solid state one. The author implies that this is because the originals are unreliable but I have to admit that I have never had one fail even 50 years or so old. This is quite interesting though and makes one think. http://www.britishv8.org/Articles/Voltage-Regulator.htm Edited April 25 by Escadrille Ecosse Link to comment Share on other sites More sharing options...
Nick Jones Posted April 25 Share Posted April 25 I’ve always stuck with the original clockwork stuff. No issues. Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 26 Author Share Posted April 26 12 hours ago, Escadrille Ecosse said: Curious as to why you wouldn't just buy a negative earth one for a TR5/6 (visually idential) and save the hassle However out interest I did a search and found this link which replaces the original mechanical bimetallic innards with a solid state one. The author implies that this is because the originals are unreliable but I have to admit that I have never had one fail even 50 years or so old. This is quite interesting though and makes one think. http://www.britishv8.org/Articles/Voltage-Regulator.htm I suppose you could why do we repair anything we could just buy or mess with Old Cars? He said it was faulty did not check and the LM7810's are pence! Plus not sure of modern ones quality! Roger Ps how many hours on the bonnet!! Ha Ha Link to comment Share on other sites More sharing options...
RogerH Posted April 26 Share Posted April 26 The TRiumph Experience forum in the USA do not like the USA Moss solid state stabiliser for its unreliability They have a chap that maskes them for a small fee. I have had one working for about 8 years with no problem Why not make your own, if you can. I do my own on lots of TR things - enjoyment. Roger 1 Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 26 Author Share Posted April 26 Hello All Just checked my notes 2011 I converted it and 54,000miles ago! I think I will call it a Win? Roger 1 Link to comment Share on other sites More sharing options...
Escadrille Ecosse Posted April 26 Share Posted April 26 1 hour ago, rogerguzzi said: Ps how many hours on the bonnet!! Ha Ha Fair point Roger But that's probably another reason why I'd just dig an old stabiliser out of the box of old spares. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now