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Dear All Thanks for the input. FWIW. But rest assured that I know EXACTLY how the blink codes are pulled up and counted ( ie OBD1) in a MB W140 1994. AA/FC, what is the info you try to get over wrt my post? OBD2 on a W140 1994?????? And ALL MB W140 were built in Germany, being sold "overseas...

My friend has a MB 420 1994. Great car. Has a fault code system you can read with a LED and count the number of flashes ( up to 32) Would like to build a simple counter with 2 off 4 bit binary counters ( ie max count well over 32 ) that feed BCD to 7 segment ICs and then two 7 segment LED...

Well, the switch is the typical receiver speaker selector. So the positio of the wires are absolutely unimportant. Solution was to remove the switchgarbage and wire the amp outputs straight to the speaker connectors. Ola

You need to calculate the flux density in order to determine the number of turns in the primary winding. With a specific core area you must have enough turns so that the flux density ( B) is below 1,15 for normal lamination in the core. If flux density is higher than that, the iron losses and...

I believe you need to determine the area of the core in order to design a transformer. Here is a start: The iron core area is determined based on lamination maximum allowed B. It can be calculated like this: E*√2 = 2π*f*A*B*n f – frequency ( 60 Hz i guess) A – core area in square meters B...

I have been using scopes for 65 years. First was a Heathkit kit scope. Useful . My all time favorite is a Tektronix 465 with top box. Have two. I have tried a few modern scopes with LOTS of functions, many of which ****. Useful for digital circuits only. I had 2 different which I palmed off...

Nickel is not a very good conductor for low currents. The radio and the repair site is in a military area, partly museum, partly training area. Camera, phone, computer not allowed. Sorry abt that. I may be allowed to take the disassembled switch to an outside location. If so pics will...

Hello to all. I am repairing an old and quite unusual radio ( submarine unit from 1937))and want to keep it as close to original as possible. A wavelength switch ( the old rotary type , ceramic body, brass switch sectors and clips ) was very corroded. Removed, disassembled and cleaned. Want...

For me, always short circuit between the earphones. Ola

Nice thread. Wonderful work and cars. For those who care to read manuals ( like me) both Girling and ATE says that you MUST NOT split the calipers in two. For whatever reason. I always split calipers when doing brake jobs. Never a problem. The worst were Willwood, which in Sweden goes under...

Repairing 4 off 1/3 HP geared repulsion motors made 1936 for the GM FUTURLINER was to keep the vehicle as close to original as at all possible. Also rebuilt and adjusted the 6 kVA generator in the rear left of the bus. Apart from that I would never touch a single phase electric motor. Ola

Issue closed Ola

Two pics Clever design Ola

Posted this under Classifieds. No response Quote I have a 750 page book " Electric Motor Repair" around 1965. Rosenberg Covers all aspects of all motortypes I have ever seen and then some. In very good condition. Weight about 1,5 kg. Clever design. You can have the text section ( two pages) and...

TRWham The electrically correct way to ground a three phas delta winding that supplies power to a grid is thru a three phase ZN reactor. Often with a resistor from N to earth. ( in the 300 to 1500 Ohm range) Fault current at a one phase direct earth on the three phase system thus limited to 15...

I have a 750 page book " Electric Motor Repair" around 1965. Rosenberg Covers all aspects of all motortypes I have ever seen and then some. In very good condition. Weight about 1,5 kg. Clever design. You can have the text section ( two pages) and the drawing section ( another two pages)open...

Kudus, great work, your SO must be happy and proud. Hope your wonderful tools will be passed down for generations. Like a +200 year old quilt from a Blue Ridge cabin Ola

In my humble opinion , the most confused person is the designer of a 3phase transformer connected in D and one corner grounded. Caveat Som large power transformers connected Yy have a third winding. Delta winding to control 3rd harmonics. No power used. To make it withstand short circuits...

There are excellent articles on the web on ZN reactors. The ZN makes a connection from three phases to ONE neutral and impedance depending on voltage relations between the three phases. Low impedance only when asymmetrical. The NER is about 200 kg, 1*0,4*0,8 m. Best are made by Metal...

Now to my last input, which only relates to the < 24 kV power disribution systems. And ONEpersonal opinion. The mass transfer of electrical energy is done by transmission companies at voltage levels above 170 kV. The systems are much influenced by the country topology and climate. In some...