Since a bicycle has no effective width, normal indicator lamps placed on each side do not give a clear indication of direction when seen from a distance, especially at night.
The bicycle turn signal indicator circuit shown is a four stage ring counter which sequentially drives four yellow lamps giving an impression of movement i.e. towards the left or right. Lamp sequencing rate can be altered by changing C1 and C2. (50uF was found to be about right). Oscillator pulses are shaped by schmitt a trigger lC1b. The decoding and output gating are performed by ICs 3, 4, and Driver transistors O1 to 08 C3 be any low current, medium gain NPN silicon.
The bicycle turn signal indicator circuit shown is a four stage ring counter which sequentially drives four yellow lamps giving an impression of movement i.e. towards the left or right. Lamp sequencing rate can be altered by changing C1 and C2. (50uF was found to be about right). Oscillator pulses are shaped by schmitt a trigger lC1b. The decoding and output gating are performed by ICs 3, 4, and Driver transistors O1 to 08 C3 be any low current, medium gain NPN silicon.
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