23 - . Back to basics

The circuit water temperature gauge works with a stable voltage ? 10 volts according to the wiring diagram.




After checking the temperature sensor and the little clock assumptions are not more guilty than the " Gauge voltage stabilizer " , the surprise is that the parts must have been a problem since it did not work.

Given this difficulty choose to open the original regulator and see what's inside and surprise Oh ! A wonderful regulator ? mechanical tension ... defective. Operates with a bimetal and a resistance wound on the bimetal to make the circuit open and closure to achieve effective V 10V.



Curious that Industrial Engineers invent things ... . Obviously here is to put technology. Let's see what they do other engineers .Telecomunication Eng. for example.

Hands On and a visit to Radio Onda, like old times, soldering iron, tin, tester and work . Old radiopitas never die.




Let's use an electronic voltage regulator with output voltage 10 V , grace is in place within the capsule where the mechanical governor was .

TO220 Package

With this circuit we obtain 1 Amp output is more than enough to feed the little clocks .



 Clean container and all necessary materials :

LM7810 integrated circuit
Condenser inlet 330 nF , 35V
Condenser outlet 100 nF , 25V
macaroni and shrink
rivets to close the set

The wiring is simple, the input (12 V ) is located on the left integrated circuit, the center pin is the ground and the right pin is stabilized and short to 10V output . The circuit also has a thermal overload protection .

Riding on the 7810 aluminum cap allows us to use the capsule as radiator



We now have a stable 10V voltage and temperature gauge work properly . Externally it is indistinguishable from the original of 1960.














VERY IMPORTANT , MUST NOT BE MOUNTED IN THE SAME PLACE IS THE ORIGINAL , IS TOO HOT AND ELECTRONIC LOCATION AND HEAT HAS NO WEAR WELL .