There is 300 mVpp line frequency ripple on the reset rail in the original PSU. ![]() Produces reset signal for digital circuitry. Current on -12V rail raises to 0,58A (normal Prophet VS -12V rail consumption is 0,35A without cartridge). ![]() Current on +12V rail raises to 0,58A (normal Prophet VS +12V rail consumption is 0,3A without cartridge).Current on +5V rail raises to 1,25A (normal Prophet VS +5V rail consumption is 0,8A without cartridge).If any of following events occurs, the AC/DC converter will latch off (as described above in the „AC/DC converter“ part): OVCP module is connected to the AC/DC converter controller IC. Overvoltage and Overcurrent Protection Module has precise voltage and current sensors for every rail. Overvoltage and Overcurrent Protection (OVCP) Module Clamping voltage is +5,1V and +-13V respectively These diodes clamp the overvoltage on +5V and +-12V rail. Zener Diode (ZD) / Transient Voltage Suppressors (TVS) At the same time +-12V rails should be also connected to the synth circuitry. To avoid useless losses in the converter, there is no internal pre-load resistor inside (as it is usual for normal multi output PSUs on the market), so be sure +5V rail is connected to the synth circuitry. 10s) of the converter from the line voltage will reset the PSU and if no fault condition is present it will start to work normally.ĪC/DC converter uses multiple output flyback topology and the +5V rail should be always loaded with at least 200mA. The red LED (in the left down corner in pictures above) will start to lit. If over-load/temperature event occurs, the AC/DC converter turns off (to be precise, the power stage turns off the converter is still powered with a line voltage). It has internal over-load/temperature protection. The converter has a universal 85…265VAC 50/60Hz input. It consists of AC/DC converter, Zener Diode (ZD) / Transient Voltage Suppressors (TVS), Overvoltage and Overcurrent Protection Module, Reset Circuit and NV-Voltage Circuit. insulator board and protection metal cover + all necessary parts to install the PSUīelow block diagram of PSU is depicted. Top metal protection plate and bottom insulator plate that covers all components under high voltage.Precise Over Voltage and Over Current Module that monitors possible fault conditions.NOISE FREE: get rid of buzzing of the old transformer.30% in old PSU) = less heat inside the synthesizer In this PSU, power components are 25☌ warmer than the ambient temperature (e.g. NO OVERHEAT! Original transformer and aluminium heat sink become hot after several hours of operation. ![]() In comparison to original PSU it has several advantages It is an universal input (85 to 265V AC) switch mode power supply (SMPS). This modern and state of art PSU is suitable to replace an old PSU in Prophet VS synthesizer. About Sequential Circuits SCI Prophet VS PSU (power supply) replacement
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