VK Powermate II Report
under
construction
Shotcomings in original design
- Marginal rectifier diodes
- DC fuse difficult to replace
- Marginal transformer
- Lack of protection against over-temperature
Modifications
- Constructed in smart instrument case
- Front and rear binding posts for 12V output
- 35A bridge rectifier mounted on rear panel
- Filter capacitance 2 x 4700 uF
- DC Fuse located on front panel
- Heatsink (Rth=12°C/W) fitted to Q1
- IC1 socketed
Performance Test
Temperature of key components
| Component |
Temperature |
| Transformer core |
|
| Rectifier |
|
| IC1 |
|
| Q1 |
|
| Q2 |
|
| |
|
| |
|
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Owen Duffy 1995, 2011. All rights reserved. Disclaimer.
