Menticol
Active Member
Hello guys!
I'm working again with my bicycle generator, driving an audio amplifier. But this time I removed the 12V SLA battery to gain a weight reduction. It was a great decision in terms of bike handling, but now I have two electrical problems I cannot get rid of:
1. Alternator whine.
I have used a full wave rectifier, and a big capacitor (10,000 uF) next to the amplifier. Almost imperceptible, but the problem persists. May I need a Choke coil?
2. Voltage limiting is lost.
Removing the battery allowed the voltage to reach 15V, so the amplifier sounds much better than before. But while riding downhill voltage may reach 20 or more volts, threatening the amplifier and my LM3915 bar display. Can you suggest me a way to limit the voltage, as shown in the (low budget) graphic?
Thank you so much!
I'm working again with my bicycle generator, driving an audio amplifier. But this time I removed the 12V SLA battery to gain a weight reduction. It was a great decision in terms of bike handling, but now I have two electrical problems I cannot get rid of:
1. Alternator whine.
I have used a full wave rectifier, and a big capacitor (10,000 uF) next to the amplifier. Almost imperceptible, but the problem persists. May I need a Choke coil?
2. Voltage limiting is lost.
Removing the battery allowed the voltage to reach 15V, so the amplifier sounds much better than before. But while riding downhill voltage may reach 20 or more volts, threatening the amplifier and my LM3915 bar display. Can you suggest me a way to limit the voltage, as shown in the (low budget) graphic?
Thank you so much!
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