Jonathan
29-12-2016, 12:00 AM
I've made a handful of these bridge rectifier PCBs for connecting with toroidal transformers to make PSUs ideal for stepper motors.
20115
20116
They have two 10,000uF 100V capacitors in parallel to give 20mF total. This is good for a machine with three of the common 3Nm stepper motors from a 50VAC toroidal transformer and OK for four 3Nm motors, though in this case I like to use two and put one on each winding.
Examples:
20119
20118
Component cost (approx):
Capacitors 2 x £2.50,
Rectifier, £0.44,
Terminal blocks, £0.30
3W resistor, £0.04,
PCB laminate, £0.30
So I think £10 each is a fair price, plus postage - 2nd class Royal mail is £2.85 up to 1kg.
If anyone buys one I'll make a diagram and post any guidance required here. If lots of people buy them I'll get PCBs made and buy the capacitors in bulk, which should reduce the price a little.
20115
20116
They have two 10,000uF 100V capacitors in parallel to give 20mF total. This is good for a machine with three of the common 3Nm stepper motors from a 50VAC toroidal transformer and OK for four 3Nm motors, though in this case I like to use two and put one on each winding.
Examples:
20119
20118
Component cost (approx):
Capacitors 2 x £2.50,
Rectifier, £0.44,
Terminal blocks, £0.30
3W resistor, £0.04,
PCB laminate, £0.30
So I think £10 each is a fair price, plus postage - 2nd class Royal mail is £2.85 up to 1kg.
If anyone buys one I'll make a diagram and post any guidance required here. If lots of people buy them I'll get PCBs made and buy the capacitors in bulk, which should reduce the price a little.