will try a LM338K...5A with 7A peak...should be plenty...thanks MrAl!!!
cp out
Search found 24 matches
- Thu Oct 04, 2007 7:15 am
- Forum: General Discussion
- Topic: Ohms Law application
- Replies: 7
- Views: 3714
- Wed Oct 03, 2007 7:22 am
- Forum: General Discussion
- Topic: Ohms Law application
- Replies: 7
- Views: 3714
- Tue Oct 02, 2007 7:28 am
- Forum: General Discussion
- Topic: Ohms Law application
- Replies: 7
- Views: 3714
Hello Mr. Al!!! I am trying to decrease the output of a 120V AC/DC 3-12V variable output, 4A switching power supply down to around a 1 V-8V range. :grin: I tried attaching a 10 Ohm, 10W ceramic block resistor but this did not drop the voltage at all when measured by an Ohm Meter. Could my resistor b...
- Mon Oct 01, 2007 8:21 pm
- Forum: General Discussion
- Topic: Ohms Law application
- Replies: 7
- Views: 3714
Ohms Law application
Kind Sirs:
I would like to drop 3.3V, 3As down to 1V, 3A with a ceramic resistor if possible. Could someone show me the correct way to figure out the proper value of the resistor and its watts?
Thank you.
I would like to drop 3.3V, 3As down to 1V, 3A with a ceramic resistor if possible. Could someone show me the correct way to figure out the proper value of the resistor and its watts?
Thank you.
- Tue Aug 21, 2007 7:28 am
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
- Mon Aug 20, 2007 10:44 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
Yeah Chris talking op temps of 95F to 140F. (Nice pooch.) Man I hope Mr. Al doesn't kill me. I have been assuming you guys have been talking F instead of C the whole time. Looking at Mr. Al's theoretical calculations now everything is actually running cooler than expected!!!! (emoticon for extreme e...
- Mon Aug 20, 2007 10:41 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
Wow what a great community there is on this board-everyone truly is interested in a lowly beginner and so helpful. This is a little embarrassing but I noted that with a moderate airflow over the heatsinks they now stay below 95 degree F on the voltage controlled voltage amplifier (12V, -12V supply, ...
- Mon Aug 20, 2007 8:29 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
I actually built one protoboard with a breadboard and then a second hardwired board. Tested both under actual conditions but unfortunately not long enough! Anyhow did the heat test tonight. Added a 3 inch heatsink, the largest I could find, attached it to the LM338 with heatsink compound and solid b...
- Mon Aug 20, 2007 1:37 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
- Mon Aug 20, 2007 7:06 am
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
Dear Mr. Al I am using a smaller heat sink for the 338K TO-3 that is diamond shape with slotted vertical fins and about 2in long 1in wide and 2 in high so it would not take too much space on the board and it was the most common one I found. I will pick up a digital thermometer tonight but I know it ...
- Mon Aug 20, 2007 4:10 am
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
- Sun Aug 19, 2007 7:23 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
- Sun Aug 19, 2007 5:26 pm
- Forum: General Discussion
- Topic: Voltage Controlled Voltage Amplifier/ Mr. Al
- Replies: 29
- Views: 12465
Voltage Controlled Voltage Amplifier/ Mr. Al
Mr. Al you recently spent an tremendous effort helping me get this circuit working exceptionally. I have a problem now in actual usage which maybe you could offer a few suggestions. The circuit powers a 12V, 30W, max 3A hydraulic solenoid. The 338K and large heatsink gets very "hot" (too h...
- Fri Aug 10, 2007 5:45 am
- Forum: General Discussion
- Topic: touch screen
- Replies: 1
- Views: 1600
touch screen
Has anyone ever played with the idea of DIY touch screen circuits.? Possibly infrared LED? I have 5, 17" monitors I would like to do so to without spending a lot of $$$ on.
Thanks you!
Thanks you!
- Fri Aug 03, 2007 9:47 am
- Forum: General Discussion
- Topic: Isolator/Amplifier
- Replies: 29
- Views: 9904
awesome
Perfect Thank you so much Al. Really sweet. The R3 gets a little warm, would it be as easy as just going to a 1.0 or 2.0 watt?? In case I want change the max output from 0-8V to 0-6V which resistor(s) would that be? You have a friend for life in Orange County Ca. / flightlinemail@cox.net Free Root C...