13 replies to this topic

[MajorFrenchy]

Just wondering if someone would know the maximum amount of power i can feed a  Knocker assembly Alvin G

 

This is the model i bought!

https://www.marcospe...l-parts/KNR-001

 

I want to push the voltage so the Knocker sounds really loud.

I asked Marcospecialties and they don't know. 

 

Thanks!

[Outhere]

Start out at a lower voltage and work your way up if you have power supplies laying around

I run this one at 43v DC with this coil AE-26-1200

https://www.pinballl...l-machines.html

[MajorFrenchy]

THX.

 

i ordered one of these. it can basically boost the Knocker up to 60V from a 24v source. I also am going to try boosting it just by using a BRIDGE RECT 1PHASE 100V 4A .  I'll see which one works best.

 

Here's the Amazon Link: HERE

Here's where i got the idea for using the Rectifier : HERE

Edited by MajorFrenchy, 11 September 2019 - 12:55 AM.

[zebulon]

Pinball Machines generally max out the voltage in the cab at 48V (50v volts and higher is considered to be high voltage and required different standards to be met with circuits and safety implementation) so 48v is likely going to be the optimum voltage depending on the coil.

 

If you are running on the original pinball machine transformer then a bridge will smooth out the half wave rectified voltage coming from it.   If you are running from a switched power DC power supply then you will get absolutely no benefit from another regulator as the supply has been rectified and smoothed by capacitance already.   The example from pinside is on a machine running from a transformer.

[MajorFrenchy]

Start out at a lower voltage and work your way up if you have power supplies laying around

I run this one at 43v DC with this coil AE-26-1200

https://www.pinballl...l-machines.html

What kind of power supply are you using or are you using a booster board? 

[Outhere]

 

Start out at a lower voltage and work your way up if you have power supplies laying around

I run this one at 43v DC with this coil AE-26-1200

https://www.pinballl...l-machines.html

What kind of power supply are you using or are you using a booster board? 

 

I am using the original power supply From the game that was in the Cabinet

https://www.vpforums...093#entry393762

[MajorFrenchy]

I now have all my components and i am having an issue. 

 

I changed the booster board for a dedicated 40V power supply. 

I have a Knocker that can handle 40V

I have a 10W 30V Relay ( Sainsmart type ) 

 

When i test the hardware, I triggers the Knocker, but it does not release it , the load stays on. Now i tested with a 24v load and it;s fine. 

 

My relay is obviously not big enough to support the 40v load. 

 

What do you guys use to trigger a high power voltage toy like this one?

[DDH69]

The rated voltages on coils are generally for a specific duty cycle, that is on time vs off time.  So it really depends what the coil is designed to do initially.  Ultimately you can use higher voltages, which pushes more current resulting in more power, usually turning into more "bang".  The side effect is heat.  The more power, the more heat.  So if the coil "fires" once every second on average, then you need enough time for the heat generated to dissipate.  If the heat builds up, then ultimately the wire insulation breaks down and the coil "burns out".  How do you tell?  Well its usually all a bit of guess work.  Sometimes you go to far and then there is no coming back because the coil is dead.

 

If you push a coil close to its limits then the real killer can be that day when something in your cabinet keeps the output on for double (or more) than you expect.  If you're running your coil on higher voltages it will fry quickly.  To avoid this if you are running over-voltage, consider a small electronic circuit to set the maximum on time.

 

I doubt any supplier will recommend a voltage greater than that in the specifications.

[MajorFrenchy]

Thanks DDH69. Long time no talk. 

 

The Knocker is rated for 50V so i am fine that way. And it is a Knocker so it will not fire very often.

 

The real issue is to find a relay board capable of handling 40v. I know Outhere uses the original 52V power supply for his knocker. I am just curious what can be used to trigger his because obviously the sainsmart can't.

Edited by MajorFrenchy, 20 October 2019 - 10:02 PM.

[DDH69]

You could always use a small solid state circuit with an optocoupler and MOSFET if you're happy with a little soldering.  It will certainly handle the voltage, current and has the advantage of being faster and quieter.

[MajorFrenchy]

do you think something like this would work? http://bit.ly/33KIfdi

[Outhere]

Maybe this

https://www.vpforums...657#entry433088

[DDH69]

Yes, just make sure the driver side voltage specification is high enough.

[MajorFrenchy]

Thanks guys! Will report back.

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