Post Created date
What does filar mean, with regards to transformers?
It's pretty common to see bifilar and similar winding configurations used on SMPS transformers these days. 1 other advantage is that bifilar winding can sometimes allow for a...
Wednesday, 25 March 2009 - 00:51
Soldering irons: Can anyone beat Radio Shack?
I like my goot iron. Its nice to hold and makes nice solder joins. When I am in china I often use hakko 936s, these are still quite ok. I've used that jbc one you've linked to....
Thursday, 19 March 2009 - 01:28
AC Relay Switch, any recommendation
djoshi, The 12V needs to be continuous. With the knowledge you seem to have you really should just get hold of a relay or two and have a play to figure out what its all about....
Thursday, 26 February 2009 - 15:10
Homemade UPS
You should consider putting your comparator circuit on the low side of your switch. This way current won't be drained after the battery has discharged. You could also consider...
Saturday, 14 February 2009 - 18:30
Charger Layout!
Some thoughts. I would try and indicate polarity a little bit better on your diode footprint silkscreen. You also look to have routed your ground quite far away from everything...
Monday, 2 February 2009 - 22:37
16kB Flash AVR in SOIC Package
Found what I'm after. Assistance no longer needed. oddbudman
Tuesday, 27 January 2009 - 23:58
12V relay using a 5V NPN transistor to turn it on.
Sounds like your doing the right thing. Have you put the diode in parallel with the coil as is shown in figure A? Its quite important to have this diode as it protects the...
Monday, 19 January 2009 - 01:59
software for drawing schematics
LTSPICE is a good one to checkout if you just want to draw schematics (no pcb). oddbudman
Monday, 19 January 2009 - 00:12
Capacitor Voltage
Higher voltage capacitors with same capacitance of the same family generally have lower ESR. A lower ESR can help reduce ripple voltage. oddbudman
Monday, 12 January 2009 - 08:08
Inverse polarity protection
You can use a mosfet. Please note this configuration is a little tricky (its not in common source mode). Also you will fry the mosfet if it has a source-gate diode. V1 is your 2...
Thursday, 8 January 2009 - 07:07
Appropriate Power Supply for LED Display
Meanwell make some nice SMPS DC power supply's- worth checking out. oddbudman
Monday, 5 January 2009 - 11:57
NiMH Battery discharging
Why not just use a current limit circuit with a big transistor connected to a heatsink? You can also measure the current using an ADC channel. This is simple enough and you can...
Thursday, 4 December 2008 - 01:56