Re: Driving Relay Coils in parallel
Driving the coils in parallel is not a problem. The built-in clamp
diodes should also present no problem. I'm not familiar with the
UDN-2891. Are you pushing its current drive capability? your load
will be approximately 124 mA. It is possible that at high temperature,
the driver went into current limiting, and the resultant output voltage
was enough to pull in one of the relays, but not the other, due to
slightly different pull-in characteristics.
.
Relevant Pages
- Re: low power coils with diodes
... > Best off not having diodes on a coil that shouldn't have them. ... > Not likely a transistor problem, ... > I'd check power leaving the solenoid driver board, and then to the coils. ...
(rec.games.pinball) - Re: low power coils with diodes
... Best off not having diodes on a coil that shouldn't have them. ... Not likely a transistor problem, ... I'd check power leaving the solenoid driver board, and then to the coils. ...
(rec.games.pinball) - TECH: Wms Coil diodes- before I make a huge mistake
... So I've been in the process of reconnecting all my coils in my BK back ... Here's the thing- probably 80-90% of the coils have diodes 'on top'- ... the coil with the diode facing toward the left lug. ...
(rec.games.pinball) - TECH: Wms Coil diode replacement help needed
... So I've been in the process of reconnecting all my coils in my BK back ... Here's the thing- probably 80-90% of the coils have diodes 'on top'- ... the coil with the diode facing toward the left lug. ...
(rec.games.pinball) - Re: add another diode bank for alternator winding on my outboard
... I assume that the diodes are nothing more than a bridge rectifier ... parallel load to the alternator stator coil. ... directed to this other battery. ... I would think that adding another diode block to the coils to charge ...
(rec.boats.electronics) |
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