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Re: Voltage Limiter Mod. Question
[Re: groundpoint6]
#257874
03/20/09 12:58 AM
03/20/09 12:58 AM
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Joined: Jan 2005
Posts: 1,647
IL
71383beep
top fuel
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top fuel
Joined: Jan 2005
Posts: 1,647
IL
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I just put in the rt engineering voltage regulator and so far it works great. It's 50 bucks but it is no hassle and it seems to do the job quite well.
'73 GK6 Challenger Rallye - 340 4-Speed
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Re: Voltage Limiter Mod. Question
[Re: dgc333]
#257876
03/20/09 11:37 AM
03/20/09 11:37 AM
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Joined: Jun 2008
Posts: 1,822
Colorado
denfireguy
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Joined: Jun 2008
Posts: 1,822
Colorado
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You are right, it is rated at 125C junction temperature. The old sheet I used specified 25C for case temperature for rated output (National Semiconductor). I looked it up on the web and now only Fairchild has a spec sheet and has no rating for case temperature but does say 125C for junction temperature, both on TO-220 cases.
TO-3 cases (no longer being made) were good for 3A with heavy heat sink.
The radio capacitor in the dash would be adequate for keeping noise on the radio down. The output capacitor in the application notes was also for suppressing transient pulses that could damage the pass transistor in the regulator. Using the small capacitor in parallel with the radio capacitor would be highly recommended.
Craig
2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado
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Re: Voltage Limiter Mod. Question
[Re: groundpoint6]
#257877
03/20/09 11:56 AM
03/20/09 11:56 AM
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Joined: Jun 2008
Posts: 1,822
Colorado
denfireguy
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
I`m confused, why do you not just use a new voltage limiter
Yes, they are still available but the technology is 1950's era. It uses a mechanical system to limit the voltage. It always bothered me that mother Mopar was ahead of the curve on things electronic like voltage regulators and alternators and yet these dinosaurs lurked in the dashboards of 1970s cars. The limiters were very reliable and very simple but the consequence of failure were three burned up gauges if the bi-metal strip stuck on.
If you want my old limiter, you are welcome to it. It still works well. I replaced it with the RT Engineering regulator.
Craig
2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado
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