Location Voltage Comment
+ supply terminal 11.98 As I already mentioned: a 12V supply
Clk0, IC1 pin 10 ~1.70 The Clk0 pin in normal operation has a 3.3V peak-
peak squarewave with 50% duty cycle. The DVM
is measuring the average of that. Measuring here
makes a lot of nasty noise in the audio.
Clk1, IC1 pin 9 ~1.70 The Clk1 pin in normal operation has a 3.3V peak-
peak squarewave with 50% duty cycle. The DVM
is measuring the average of that. Measuring here
makes a lot of nasty noise in the audio.
Pair of pads near IC1
pins 5 and 6
3.40 This is the voltage of the Si5351A supply, pins 1 &
7
Top end of D2 4.96 This is the +5V regulated supply
T1 pins 1, 2, 3 & 4 0.00
T1 pins 5, 6, 7 & 8 2.36
Left side of C43 2.28 C43-46 are the QSD integrating capacitors. The
voltage across each one differs slightly. The
following measurements show these small
differences.
Left side of C44 2.44
Left side of C45 2.42
Left side of C46 2.30
IC5 pin 1 2.64 IC5a output, the pre-amp I output
IC5 pin 2 2.46
IC5 pin 3 2.26
IC5 pin 4 0.00
IC5 pin 5 2.28
IC5 pin 6 2.46
IC5 pin 7 2.44 IC5b output, the pre-amp Q output
IC5 pin 8 11.67 This is the supply voltage minus the voltage drop
caused by reverse polarity protection diode D33
IC6 pin 1 2.44 IC6a output
IC6 pin 2 2.44
IC6 pin 3 1.63
IC6 pin 4 0.00
IC6 pin 5 1.55
IC6 pin 6 2.44
IC6 pin 7 2.44 IC6b output
IC6 pin 8 11.67
IC7 pin 1 2.64 IC7a output
IC7 pin 2 2.64
IC7 pin 3 1.99
IC7 pin 4 0.00
IC7 pin 5 1.89
IC7 pin 6 2.64
IC7 pin 7 2.64 IC7b output
IC7 pin 8 11.67
IC8 pin 1 2.46 IC8a output
IC8 pin 2 2.46
IC8 pin 3 0.65
IC8 pin 4 0.00
IC8 pin 5 0.67
IC8 pin 6 2.48
108
To Next Page
Loading...
Need help?
General
