OhmEigaMan
New Member
Greetings Gurus:
As an experiment, I'm trying to trigger a 50V pinball solenoid from a 5v logic pulse, but I'm a little confused (and my electronics knowledge is introductory at best). I'm basing my circuit on a schematic from a pinball machine.
On this schematic, there's a 50V supply and 3.0 Amp slo-blo fuse. So I purchased a 48V 3.3 Amp supply thinking it would work fine. Then I checked the solenoid. The coil is 4 ohms. If I'm doing my math right, that means it's going to pull a whopping 12A.
Now, also on the schematic (before the fuse) there's a 100uF/150 volt capacitor and a 10K 0.5W resistor in paralell. I'm guessing this is to allow for the spike in Amps? I searched the internet for RC circuit info, but couldn't really find anything for these in paralell, only info on how long it would take to discharge/charge if in series.
I'm wondering:
1) If I energize the solenoid for 0.1 seconds (or even 0.25 seconds), am I going to destroy my power supply? And if there's any info or links you know of that would explain the paralell cap and resistor, that'd be great.
2) And if I energize the solenoid for that amount of time, will I destory my 100V 4A rated Darlington Transistors? Or can they tolerate that amount of current for a brief time? The schematic actually uses a TIP102 transistor, but I found this board with the Darlington transistors and the necessary protection diodes (for when the coil de-energizes) already in place.
Thanks in advance for any insights and thoughts!
As an experiment, I'm trying to trigger a 50V pinball solenoid from a 5v logic pulse, but I'm a little confused (and my electronics knowledge is introductory at best). I'm basing my circuit on a schematic from a pinball machine.
On this schematic, there's a 50V supply and 3.0 Amp slo-blo fuse. So I purchased a 48V 3.3 Amp supply thinking it would work fine. Then I checked the solenoid. The coil is 4 ohms. If I'm doing my math right, that means it's going to pull a whopping 12A.
Now, also on the schematic (before the fuse) there's a 100uF/150 volt capacitor and a 10K 0.5W resistor in paralell. I'm guessing this is to allow for the spike in Amps? I searched the internet for RC circuit info, but couldn't really find anything for these in paralell, only info on how long it would take to discharge/charge if in series.
I'm wondering:
1) If I energize the solenoid for 0.1 seconds (or even 0.25 seconds), am I going to destroy my power supply? And if there's any info or links you know of that would explain the paralell cap and resistor, that'd be great.
2) And if I energize the solenoid for that amount of time, will I destory my 100V 4A rated Darlington Transistors? Or can they tolerate that amount of current for a brief time? The schematic actually uses a TIP102 transistor, but I found this board with the Darlington transistors and the necessary protection diodes (for when the coil de-energizes) already in place.
Thanks in advance for any insights and thoughts!