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"The supplied power transformer should be rated at 7.5 VAC rms ±5% @ 1A"
"Use DMM to measure VDC and measure the following points:
Regulated +5V -> U117 pin3/2 -> 5VDC ±5%
Unregulated +5V -> U117 pin1/2 -> 9.2VDC ±10%"
POWER UP DIAGNOSTIC TESTS
To enter Diagnostic Mode, apply power to the MRC while pressing the button above the leftmost slider.
Power up diagnostics run automatically upon power up in Diagnostic Mode
Internally, the AC is rectified by full wave bridge rectifier BR101. It's output is capacitively filtered producing the unregulated DC voltage monitored by the ADC (U112)
+ 5VCC is produced from the unregulated DC by a TO-220 packaged LM7805 voltage regulator (U117). Tantalum caps are used to filter both input and output of U117.
VCC over-voltage protection and current limiting functions are provided by U117
U117 = 7805 (LM 340 T-5) linear ic
U112 = ADC 0809 converter ic
BR-101 = diode bridge 2A 200V

Waarom niet dan? Ik heb al meerdere malen probleemloos een AC adapter door een DC vervangen...ik zou geen DC adapter gebruiken!
En wat is jou conclusie Rvooh ?
Zo te zien aan de spects word het allemaal daarna afgevlakt en geregeld.
78xx kan zo'n 35 tot 40 volt verdragen.
Waarom niet dan? Ik heb al meerdere malen probleemloos een AC adapter door een DC vervangen...