Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: P.C.S. on August 12, 2010, 10:02:42 AM

Title: Mach 3 Charge pump circuit layout, problem
Post by: P.C.S. on August 12, 2010, 10:02:42 AM

Hi guys,

my name is Phil and I'm working on a PCB for the mach3 charge pump circuit following the circuit by Mariss Freimanis in the support download area.


I attached a picture of my layout for the circuit no. 2. It only switches my relays properly, when the voltage connected to +5V DC is lowered to about 4V DC.
The only modification I made is a IRF1404 mosfet. IC pin connections like in the datasheet of the HEF4538.

I could install a +4V voltage regulator, but this does not solve the basic problem with the circuit. I would appreciate any help or advice very much.

Thanks in advance.
Phil

(http://img843.imageshack.us/img843/4428/unbenannths.png)

Title: Re: Mach 3 Charge pump circuit layout, problem
Post by: Tweakie.CNC on August 12, 2010, 12:51:57 PM

Phil,

Dont know if this would make any difference but the capacitor in the circuit diagram is 0.01uf your pcb shows 0.1uf.

Tweakie.

Title: Re: Mach 3 Charge pump circuit layout, problem
Post by: P.C.S. on August 12, 2010, 12:56:56 PM

Hi Tweaky,

thanks for your reply. It would make a difference, but the capacitor in the circuit is 0.01µF. Just a typo in the PCB layout.


Phil