JFET preampThis preamplifier with JFET transistor sounds great. It operates in similar manner to vacuum tubes. The circuit is very simple to build and can be used as a booster.
Enclosure drilling Step 5 of 5
Choose an enclosure (www.taydaelectronics.com/hardware/enclosures.html), use the drill service (www.taydaelectronics.com/hardware/enclosures/enclosure-custom-drill-service.html) and the UV printing service (www.taydaelectronics.com/hardware/enclosures/enclosure-uv-printing-service.html).
Adjust the diameter of hole #3 for the DC connector (9 mm works for most of the connectors).
Adjust the diameter of hole #5 for the LED as follows (for painted enclosures):
- 3 mm LED: 3.2 mm
- 3 mm LED metal holder: 6 mm
- 5 mm LED: 5.2 mm
- 5 mm transparent holder: 6.5 mm