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Power Supply 6 - 9 - 12 V x 1 A - I (CB1178E)

   In fact, the maximum output current of this source depends on the transformer which can be 6, 7.5, 9 or 12 V, depending on the desired voltage and current up to 1 A. The zener determines the output voltage. R1 is 470 Ohms and rectifier diodes of type 1N4002 or 1N4004. The transistor must be equipped with a heatsink. Filtration can be improved by increasing the value of C1.