# 14.6: Circuit Verification Data Sheet

1. Output Voltage and LED Test: LED operational _________

Output Voltage Range of Adjustment _______ to ________

2. Adjust output to 5 VDC with a 20 ohm load resistor attached to the output.

Calculate the power being dissipated by the 20 ohm resistor? _________

3. Calculate the expected turns ratio of the transformer from the transformer data listed on the Bill of Material. Calculate and measure $$V_{Sec}$$ RMS.

Calculated n = _________ Calculated $$V_{Sec}$$ RMS = __________

Measured $$V_{Pri}$$ RMS = _________ Measured $$V_{Sec}$$ RMS = _________

4. Calculate the expected DC Voltage (VDC) and Peak to Peak Ripple $$(V_{rpp})$$ out of the filter circuit using the formula: $$V_{rpp} = I_{LOAD}/f_C$$ where $$f$$ = frequency and $$C$$ is the value of the filter capacitor. Use a load current of 70 milliamps.

Calculated VDC = __________ Calculated $$V_{rpp}$$ = __________

5. Measure the DC Voltage (VDC) and Peak to Peak Ripple $$(V_{rpp})$$ out of the filter circuit values with the 20 ohm resistor in place:

Measured VDC = __________ Measured $$V_{rpp}$$ = __________

6. Measure VDC and $$V_{rpp}$$ of the output voltage of the power supply with the 20 ohm load resistor in place.

VDC of the Power Supply Output = _______

$$V_{rpp}$$ of the Power Supply Output = _______