| 摘要 |
PURPOSE:To actuate assuredly a load circuit even though the characteristic of a circuit element vary or the using condition is strict, by providing a means which actuates the load circuit with application of the rectified and smoothed voltage of a commercial power supply when a power supply switch is applied. CONSTITUTION:An actuating circuit actuates a load circuit with application of the rectified and smoothed voltage of a commercial power supply when a power supply switch is applied. For instance, when a power supply switch SW is turned on, the output voltage V1 of a rectifying/smoothing circuit 11 is applied to the collector of an error amplifying transistor TRQ11 via a diode D11 to turn on said collector. Then the voltage V1 is applied to a load circuit 12 via a resistance R11 to actuate the circuit 12. Then the rectified and smoothed voltage VB is fed from the circuit 12 to set the cathode potential higher than the anode potential of the diode D11, and only the voltage VB is applied to the TRQ11. Then the TRQ11 is biased stably via a diode D12, and a stabilized circuit consisting of the TRQ11, Q12, etc. is actuated stably. |
