| 摘要 |
PURPOSE:To variously change the on/off of light sources and to improve advertising and decorating effects by automatically and successively switching the frequency levels of clock pulses to be supplied to a control counter. CONSTITUTION:The 1st oscillation circuit 1 oscillates pulses with frequency set up by a variable resistor VR1 and supplies clock pulses to the 1st counter 2. Respective output terminals Q0, Q1, Q2 output pulses with respectively different frequency levels and supply their outputs to respective inputs IN0 IN2 of a data selecting circuit 3. The 2nd oscillation circuit 5 also oscillates pulses with frequency set up by a variable resistor VR2 and supplies clock pulses to the 2nd counter 6. The 2nd counter 6 successively shifts the states of respective outputs Q0-Q2 every impression of a clock pulse, controls the control inputs C0-C2 of the data selecting circuit 3 and increases/decreases the frequency of pulses outputted from the data selecting circuit 3 to the control counter automatically in stages. |
