Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: Silver_79 on August 10, 2009, 08:51:44 PM

Title: Ok this is a little sad
Post by: Silver_79 on August 10, 2009, 08:51:44 PM

Hi again all I am working on bench testing my voltage reg circuit, its the same circuit that is on the bottom of the regulating a constant voltage tutorial. My prob here is actually kinda embarrassing since I am working on associates in computer engineering and a B.S. in EET. I was hooking up the circuit and did so with little effort. The circuits been failing and I checked everything individually except the MPS222A transistor I am using as the switching transistor. I checked the 5V reg by hooking it up to a 9V and checking the out for the 5V which it produced but I never used a transistor for switching, so I have no idea how to check it. Is it hooked up the same as the 7805A V-reg I am using ? In my prog. we rarely use single components other than Inductors , caps , and resistors or batteries. I think next year here I get into some more complex elect. with my Electronics I course and lab but I do know it continues on from Circuits II which was about DC/AC and all the math like Phase angles. Anyway I don't really get the switching trans so please help :P

Title: Re: Ok this is a little sad
Post by: Soeren on August 11, 2009, 03:55:40 PM

Hi,

Quote from: Silver_79 on August 10, 2009, 08:51:44 PM

[...] its the same circuit that is on the bottom of the regulating a constant voltage tutorial.

You provide the direct link, then we can spend time helping you instead of searching for the circuit.

Title: Re: Ok this is a little sad
Post by: Silver_79 on August 11, 2009, 05:38:16 PM

Ok, sry here it is:

http://www.societyofrobots.com/schematics_powerregulation.shtml

Title: Re: Ok this is a little sad
Post by: billhowl on August 11, 2009, 09:47:03 PM

Which switching regulator are you used?

Here are some switching regulator that you can use.

MC34063 Based Switching Regulator Adapter, Step-Down Input Voltage: +5 ~+24V DC Output +2.5V ~+12V. 0.5Amp
http://www.sureelectronics.net/goods.php?id=365 (http://www.sureelectronics.net/goods.php?id=365)

Switching Regulator Input: 5.5V-23V output 5V/6V 3A
http://www.dealextreme.com/details.dx/sku.15149 (http://www.dealextreme.com/details.dx/sku.15149)

5V 1A Switching voltage regulator, pin-compatible with the common 78XX family
http://www.dimensionengineering.com/DE-SW050.htm (http://www.dimensionengineering.com/DE-SW050.htm)

Consider discreet circuits like  "The Black Regulator" Input: 10v to 18v output +5V, +12v 70mA to 300mA
http://www.romanblack.com/smps/smps.htm (http://www.romanblack.com/smps/smps.htm)

Title: Re: Ok figured it out.
Post by: Silver_79 on August 15, 2009, 12:09:26 PM

Turns out the component I was using was just a high speed switching transistor not a Switching voltage Reg. I got a new one inc from Akron Ohio, got two actually so I can make a new circuit as a backup and as a gnd for a new robot I want to make after Feddar (my 50$ inspired robot) is done. One good question though, should I take these new Voltage regs and put them in a socket ? there are pricey for a component and they are variable outputs from dimension engineering. Got the site from the post above, btw ty Soeren for the info helped me a bunch and saved me tons of time. :P