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Topics - The Radio Shop

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196
Design, Project / scratch built LM317 varible supply
« on: March 14, 2015, 03:24:37 PM »
I have been needing a new bench supply for a while now. The last day I was in Radio Shack I picked up one of there 24 volt 2 amp transformers for 5 bucks. So I decided this morning to throw a supply together from some spare parts I have.

Parts List:
•One  perfboard
•LM317 variable voltage regulator
• Bridge Rectifier
•Heat Sink
•120 VAC to 24 VDC transformer (mine is part number 273-1512b Radio Shack)
•Power cable
•Two 1000 microfarad capacitors
•One 0.1 microfarad capacitor
•One 1 microfarad capacitor
•One 100 ohm resistor
•One 5k ohm variable resistor
•One 1N4002 diode

The case is one I bought 10 years ago. I had removed the 13.8 supply from the case to go in my homebrew 6 meter rig. So the empty case came in handy.

197
Announcements / Test
« on: March 04, 2015, 06:38:40 PM »
Test

198
Electronic Video Blog / IFR 1200 service monitor memory reset and checksum error
« on: February 28, 2015, 08:10:33 PM »

199
Electronic Video Blog / B&K 2040 modulation meter error
« on: February 28, 2015, 08:08:02 PM »

200
Electronic Video Blog / Cobra 29 dead receiver
« on: February 28, 2015, 08:06:37 PM »

201
Electronic Video Blog / HP8640b part 3
« on: February 28, 2015, 08:05:08 PM »

202
Electronic Video Blog / HP8640b part 2
« on: February 28, 2015, 08:03:51 PM »

203
Electronic Video Blog / HP8640b part 1
« on: February 28, 2015, 08:02:24 PM »

204
Microcontrollers / Spoon feed pic programming
« on: February 28, 2015, 05:30:54 PM »
This is one of the best pic programming video I have ever watched.
He puts it out in a term every one can understand.
Videos from ModelerManMike



Part 1 - http://youtu.be/DJlT0ZIQiO8 Installing MPLab and Hi-TechC / Obtaining a Pickit Programmer
Part 2 - http://youtu.be/IR2s0dn-dQU General Pic information / Bread boards / Proto Boards / Components
Part 3 - http://youtu.be/sknu-vHE47M Build a 12F683 Test Board
Part 4 - http://youtu.be/OZvKsDClYAs Write our first 12F683 and save to our test board and 12F683
.


205
Microcontrollers / The $20 LCR ESR transistor tester
« on: February 25, 2015, 10:47:34 AM »
This was the first tester I purchased.  Worked really good.
Then one day testing a 100uf cap I forgot to discharge the tester took the load of the cap.

It now fails to come on. So perhaps it took out some components or maybe wiped the processor.

I am going to install a header and see if I can communicate to the processor.

206
Microcontrollers / Old ancient computer eprom programming
« on: February 22, 2015, 12:14:00 PM »
Thanks to Richard I was able to get my old programmer up and running. What I was lacking was a computer! He supplied me with a working pc running windows 98.


207
Test Equipment / HP8640b signal gen repair thread
« on: February 04, 2015, 05:23:46 AM »
Thought I had posted this on the site but guess not.
I will link in the 3 part repair videos tonight.

208
RADIO MODS / 33mhl
« on: January 29, 2015, 05:35:03 AM »
scemo

209
Test Equipment / B&K 1472b osciloscope
« on: January 06, 2015, 09:19:33 PM »
Manual upload

210
Test Equipment / Gaw 1500 Signal generator for CB
« on: January 02, 2015, 03:10:14 PM »
Went and saw an old friend of mine this morning. While there I picked this signal generator up.
Does not work properly but cannot seem to find any info on it.

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