Brushed motor diode/cap/???

Brushed, nicad, radios, etc...

Moderators: scr8p, klavy69

Andybellus
Approved Member
Posts: 57
Joined: Wed Jun 28, 2023 7:19 pm
Location: SoCal
Has thanked: 27 times
Been thanked: 21 times

Brushed motor diode/cap/???

Post by Andybellus »

School me on the need and “how to” for a diode? Cap? Not sure what it’s called that was added to a brushed motor back in the day. I think it was to reduce radio interference? Still needed today?

User avatar
GoMachV
Approved Member
Posts: 12185
Joined: Sun Apr 29, 2012 10:31 pm
Location: Twin Falls, ID
Has thanked: 1080 times
Been thanked: 3730 times

Re: Brushed motor diode/cap/???

Post by GoMachV »

Caps were used either in a pair or trio for motor noise. Not needed on modern radios. Shottkey diode was only used with forward only speed controls to assist with braking.

User avatar
morrisey0
Approved Member
Posts: 1726
Joined: Wed Jan 13, 2021 2:45 pm
Location: Richmond, VA
Has thanked: 74 times
Been thanked: 1742 times

Re: Brushed motor diode/cap/???

Post by morrisey0 »

For recreations of older cars, yes, still needed ........... for looks.

For any functional purpose with modern radios, nope.
I build RCs like people would have done back in the '90s ..................................... if they had 3D printers.

User avatar
juicedcoupe
Super Member
Posts: 3433
Joined: Sun Aug 16, 2020 4:05 pm
Location: Pascagoula, MS
Has thanked: 264 times
Been thanked: 2015 times

Re: Brushed motor diode/cap/???

Post by juicedcoupe »

You guys put modern radios in vintage cars? Eww.

Most of my stuff still uses 27 and 75mhz AM radios. Using modern stuff just doesn't feel right.

And while I do have a fairly large collection of vintage transmitters, most of my runners use a Futaba T2PL, JR XR2i, or Airtronics MX-A (also have a Kyosho variant), which I have 2 or 3 of each. The XR2i is probably my favorite, it just feels right.
Always looking for new and interesting ways to waste money.

Andybellus
Approved Member
Posts: 57
Joined: Wed Jun 28, 2023 7:19 pm
Location: SoCal
Has thanked: 27 times
Been thanked: 21 times

Re: Brushed motor diode/cap/???

Post by Andybellus »

Thanks guys!

Yeah I’ll be using a modem remote for my JRxT runner with a modern Hw ESC and 13.5 so no worry’s there, but still looking for a Reedy Mr A or B for my RC10T so will want that to be correct-ish looking…

Not a purist and neither are exact replicas so don’t care for the old radios hahahaha

Maybe I shouldn’t have said that, I hope you guys will still answer my dumb questions? 😂

Happy Friday!

User avatar
RC10th
Approved Member
Posts: 4699
Joined: Sat Feb 16, 2013 9:51 am
Location: Australia
Has thanked: 50 times
Been thanked: 1492 times

Re: Brushed motor diode/cap/???

Post by RC10th »

Well, modern radios are technically safer for old cars, nothing worse than a bad glitch or runaway which causes you to break something rare, hard to find and expensive....
I was old school - when old school wasn't cool !

Dadio
Approved Member
Posts: 4054
Joined: Sun Apr 24, 2016 2:21 pm
Location: Guildford UK
Has thanked: 2697 times
Been thanked: 2234 times

Re: Brushed motor diode/cap/???

Post by Dadio »

Andybellus wrote: Fri Oct 06, 2023 10:39 pm Thanks guys!

Yeah I’ll be using a modem remote for my JRxT runner with a modern Hw ESC and 13.5 so no worry’s there, but still looking for a Reedy Mr A or B for my RC10T so will want that to be correct-ish looking…

Not a purist and neither are exact replicas so don’t care for the old radios hahahaha

Maybe I shouldn’t have said that, I hope you guys will still answer my dumb questions? 😂

Happy Friday!
I've always thought it's better to look stupid than be stupid , always ask :!:
If a jobs not worth doing then its certainly not worth doing well.
A problem shared is a problem halved but an advantage shared is no advantage at all.

User avatar
TRX-1-3
Approved Member
Posts: 2013
Joined: Sat Mar 29, 2014 12:13 pm
Location: USAG Humphreys, South Korea
Has thanked: 1940 times
Been thanked: 944 times

Re: Brushed motor diode/cap/???

Post by TRX-1-3 »

Dadio wrote: Sat Oct 07, 2023 3:51 am
Andybellus wrote: Fri Oct 06, 2023 10:39 pm Thanks guys!

Yeah I’ll be using a modem remote for my JRxT runner with a modern Hw ESC and 13.5 so no worry’s there, but still looking for a Reedy Mr A or B for my RC10T so will want that to be correct-ish looking…

Not a purist and neither are exact replicas so don’t care for the old radios hahahaha

Maybe I shouldn’t have said that, I hope you guys will still answer my dumb questions? 😂

Happy Friday!
I've always thought it's better to look stupid than be stupid , always ask :!:
Part of knowing what you are doing is knowing when you don't know what you are doing. That's when you ask. Then you know more about what you are doing.
Hope you're doin' something fun.

User avatar
jcwrks
Approved Member
Posts: 661
Joined: Wed Jun 21, 2017 3:40 pm
Location: San Angelo, TX
Has thanked: 169 times
Been thanked: 382 times

Re: Brushed motor diode/cap/???

Post by jcwrks »

Not all motors required a Schottky unless it was mentioned in your esc manual. The caps (not diodes) were typically .1 uF ceramic disc and you used two. Some esc's wanted you to use 3. Some kits had an electrolytic or tantalum cap.

Motor_Caps_RCCA 09-1994.JPG
Buds_caps.jpg
The TX SKUNK

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post

Return to “Vintage Electronics”

Who is online

Users browsing this forum: No registered users and 5 guests