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PHASE 2
DC Voltage Control and Regulation
2-1. Install diode D11, type 1N4002, making sure that its
banded cathode end is oriented as outlined on the board.
2-2. Install diode D12, type 1N4002, per step 2-1.
2-3. Install resistor R15, 3.3K (orange-orange-red).
2-4. Gently loop the 4 wires installed for the Phase 1 audio
test around the body of the R17 volume control so that their
connections will not be weakened during further assembly.
Install the following resistors:
2-5. Resistor R26, 560 ohms (green-blue-brown).
2-6. Resistor R27, 4.7K (yellow-violet-red).
2-7. Resistor R24, 22K (red-red-orange).
2-8. Resistor R9, 10K (brown-black-orange).
2-9. Referring back to Step 1-14 as needed, install Q5, the
other MPS6514 transistor supplied with your kit.
2-10. Review Step 1-15 regarding the correct installation of
ELECTROLYTIC capacitors, noting that the ( + ) side for each
capacitor is clearly marked on the board.
2-11. Install C33, 33 μF electrolytic, per Steps 2-10, 1-15.
2-12. Install C32, 100 μF electrolytic, per Steps 2-10, 1-15.
2-13. Install C29, 10 μF electrolytic, per Steps 2-10, 1-15.
2-14. Examine U2, the 3 pin type 7805 voltage regulator. It
must be installed with its imprinted side facing R27. The line
within its board outline designates the bare metal heatsink side.
2-15. Install voltage regulator U2 per step 2-14.
2-16. Referring to Step 1-22 as needed, install a bare wire
jumper at "JUMPER" near "R20A." (NOTE: R20A, R20B, and
R20C are the connecting points for the main tuning control.)
2-17. Double-check your work in Steps 2-1 to 2-16.
This completes the wiring of the DC voltage regulation circuitry.
While the output of U2 could be checked for 8 volts, no testing
is necessary at this point.
1253 - 22
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