Looking for a power supply that meets Walthers specs or the 110' turntable with DCC
"TT Control Power 12-18 VAC or 16-24 VDC 250 ma"
Why couldn't they make it a standard 12vDc? I have a bunch of those!
Did a Google search but cant find one that has the required voltage and 250mA
Gary
Are more amps a problem for this application? The motor draws amps, the power supply does not force extra amps down it's throat.
Henry
COB Potomac & Northern
Shenandoah Valley
My Walthers 130' turntable is powered by an MRC 1370 Railpower which puts out 18 VDC. Works like a charm.
Rich
Alton Junction
The most likely reason it requires a higher voltage on DC is that it most likely has a full wave bridge rectifier in their controller. This is why it can operate either AC or DC. A bridge rectifier is essentially 4 diodes and typical voltage drop across a diode is about 1.5 volts. So to get the necessary 12 volts you would need a minimum of 13.5 volts VDC input. My guess is that they designed their circuitry to run on the standard 12VDC but wanted the AC option later so they dropped in the bridge rectifier. Its easier the change a spec sheet than to revise a circuit board. I wouldn't be surprised though if the circuitry actually steps down and runs at 5v (internal to the board) as most solid state IC's are designed to run at 5v or 3.3v.
Amazon sells all kinds of power supplies. You need one that has a minimum of 250 mA. Going higher on current is ok because it will only pull what it needs.
https://www.amazon.com/s?k=16+vdc+powersupply&ref=nb_sb_noss Here is a quick search that will give you several choices.
Colorado Front Range Railroad: http://www.coloradofrontrangerr.com/
gdelmoro Looking for a power supply that meets Walthers specs or the 110' turntable with DCC "TT Control Power 12-18 VAC or 16-24 VDC 250 ma" Why couldn't they make it a standard 12vDc? I have a bunch of those! Did a Google search but cant find one that has the required voltage and 250mA
Most doorbell transformers are 18vac. You could wire one up and use that. Or there are all sorts of wall wart type transformers that you can find that can work.
richhotrain My Walthers 130' turntable is powered by an MRC 1370 Railpower which puts out 18 VDC. Works like a charm. Rich
thanks Rich, that's hat i did.
gdelmoro richhotrain My Walthers 130' turntable is powered by an MRC 1370 Railpower which puts out 18 VDC. Works like a charm. Rich thanks Rich, that's what i did.
thanks Rich, that's what i did.
What I like most about the MRC 1370 is the adjustable voltage by rotating the big dial from 1 to 18 VDC. If resistored LEDs are still too bright, instead of adding more resistors, just dial down the voltage output on the MRC 1370.
I'm a little confused about the "or" statement in your post. My club's Walther's 130' TT requires a 16V AC input to drive the TT motor and a separate input (either DC or DCC) to provide track power to the TT bridge. We use an MRC TechII 2500 to provide a 16V AC voltage which is then voltage regulated by the Walther's control module to 14.5V AC which is then full-wave rectified (also in the control module). We chose to tap the DCC power off of our layout track to power up the TT bridge track. We are considering using a DCC command station to power up the bridge track to avoid shorting issues as much as possible.
hope this helps.
Redvdub1I'm a little confused about the "or" statement in your post.
The OP was quoting directly from the instructions
https://www.walthers.com/fileuploader/download/download/?d=0&file=attachments%2F09330000002859.pdf