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My wife likes to sleep with the sound of a motor of some kind running, like a fan or air conditioner etc. Just a steady hum.
I'd appreciate comments about the schematic and board layout.
[...] Since there won't be any load to speak of on the motor I'm thinking that will be ok. Am I missing something there?
Tinnitus?Whether or not, I'd suggest making a rain/wave sound simulator instead, as this will be more controllable, use less power and will be adjustable in several ways - sound level, "bandwidth" and "center frequency" (white, brown, pink, grey, blue or purple noise and variations hereof, if that makes any sense to you), sound envelope (ADSR) and repetition period.
The Schematic:FusingAlways use separate fuses for each branch (i.e. one for the line going to the motor and one for the line to the regulator).
TransistorThe emitter of Q1 should go to 0V and the motor goes between +12V and the collector. As it stand, the controller won't be able to open Q1 and might damage the controller through leakage from collector to base. The base of a TIP120 must be around 2.5V positive with reference to its emitter for it to open.
As I'm not sure about the purpose of JP1, I can't tell you if it's good or bad, but I'm sure you have a purpose for it
Even if you tidy up both schematic and PCB and gold-plate the latter, I'd still prefer the aforementioned sound generator - If interested, I can dig up the schematic and board for a pretty simple unit that can be modded fairly easy.
I don't understand what you have in mind for the sound generator, but it sounds interesting. How would you do that?
Was the trip value of the fuse I ordered ok? I'm not sure I understand the different values in the data sheet.
That's odd, I built a prototype that works as expected. PWM control of the transistor, etc.I just looked again and realized that I forgot to change the unregulated supply symbol. It's not really 12 volts, more like 6. Sorry.
It's a connection for a potentiometer so she can change the speed of the motor.
Glad I posted that here before sending it off, sounds like I would have wasted some money.