Search found 409 matches

by edocaster
10 Jul 2020, 1:37pm
Forum: Bikes & Bits – Technical section
Topic: DIY dynamo light
Replies: 31
Views: 1031

Re: DIY dynamo light

Nowadays I actually ride mostly with a B&M Cyo Premium, which is pretty good for the price I paid. That said, and without wanting to open a can of worms on this topic, whenever I ride out onto my main road there is a large glass window on the other side of the street which reflects back whatever...
by edocaster
10 Jul 2020, 8:46am
Forum: Bikes & Bits – Technical section
Topic: DIY dynamo light
Replies: 31
Views: 1031

Re: DIY dynamo light

It's doable, but if you're not interested in electronics there's not much point. Cost savings are minor at best. The main benefit is you can build something noone is selling (for reasonable money) - but only if you know what you want and like the learning process. Here's a light I made: http://www.c...
by edocaster
30 Dec 2018, 5:55pm
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

TW1 is a SMD code for the dual common cathode schottky BAT54C. It is essentially two diodes that share a common cathode. It would appear to be a pnp transistor if tested using a multimeter. The BAT54C simply acts as two half-wave rectifiers charging the 1.0F capacitor via the 10ohm resistor. It isn...
by edocaster
29 Dec 2018, 11:36pm
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

that is how 'crowbar' circuits work I think. Hub dynamos are current-limited anyway, so this means of limiting the voltage is actually quite a neat arrangement. Also, isn't shimano's voltage regulator gizmo similarly configured? cheers Embarrassingly, I forgot most of what I learned two years ago, ...
by edocaster
28 Dec 2018, 12:21am
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

I finally had a chance to sketch a circuit diagram for the Pico 30. It might have a few errors and non-standard symbols, unfortunately: IMG_20181227_205608s.jpg The above was achieved by looking at the traces and a bit of prodding around with a multimeter. I was surprised the transistor was on the A...
by edocaster
7 Dec 2018, 7:12pm
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

Edit: the current Pico 15 is 15 lux. The Blueline 30 may have replaced the old Pico. €15 at bike-discount just now . Axa are annoying with their product range sometimes! Honestly, for them to release a 15 lux version they would have to purposefully gimp the 30 lux version. These lights have to run ...
by edocaster
7 Dec 2018, 12:29am
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

Here are a few images from my old Axa Pico 30. As outlined previously, it started to cut-out at speed. I'm loathe to chuck it just yet - maybe the teardown will help someone. I was surprised that the whole thing came apart from unscrewing just one screw. There were no seals and no real waterproofing...
by edocaster
1 Dec 2018, 11:30am
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

So I've had the Cyo Premium for a few days now, including riding through awful rain. My impression so far is positive, although I found the beam a little too optimised. The Axa Pico was a little more forgiving, whereas the Cyo needs 'perfect' aim, yet I'll seldom be riding in a flat, straight line. ...
by edocaster
17 Nov 2018, 10:30pm
Forum: Does anyone know … ?
Topic: WTO tariff codes and rates for bikes/frames?
Replies: 11
Views: 1000

Re: WTO tariff codes and rates for bikes/frames?

What is more interesting is what will happen to imports from outside the EU: https://www.cyclist.co.uk/in-depth/2233/brexit-and-the-bicycle-what-could-a-no-deal-departure-from-the-eu-mean-for-cycling The provisional finding is that punitive trade measures on bicycles could be terminated: https://www...
by edocaster
17 Nov 2018, 10:14pm
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

Just a heads up, but Amazon may have good prices for: B&M 'Eyc T': https://www.amazon.co.uk/Busch-Müller-LED-Headlight/dp/B00FEIUC74?th=1 - £20 and B&M 'Cyo Premium Senso': https://www.amazon.co.uk/Busch-Müller-Lumotec-Premium-dynamo/dp/B00GO9WBGC/ref=cts_sp_4_vtp - £29 The descriptions are ...
by edocaster
2 Nov 2018, 7:50am
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7841

Re: Dynamo Lighting - fit and forget?

My Axa Pico 30 is finally playing up, after three years. It flickers and cuts out at speed now, resetting when stopped. Sounds almost exactly like a resettable overvoltage crowbar. Obviously it shouldn't be happening if the light is enough to saturate the 500mA from the dynamo. I'm not sure what has...
by edocaster
21 Jun 2018, 7:48am
Forum: Does anyone know … ?
Topic: Crisis in confidence in bike quality
Replies: 40
Views: 3019

Re: Crisis in confidence in bike quality

I don't know about the hybrids, but I've commuted on a Decathlon Triban 3 road bike for the last 7 years. Nothing needed unduly early changing.
by edocaster
5 May 2018, 10:58pm
Forum: Does anyone know … ?
Topic: This must be a first
Replies: 22
Views: 2895

Re: This must be a first

I went back to the shop and picked one up today. I.e. physically picked one up, not bought one. Turns out there are two cleats in the pack - the second one is behind the card - and a complete set of nuts and bolts. Now that really is a crazy price.
by edocaster
29 Apr 2018, 10:03pm
Forum: Does anyone know … ?
Topic: This must be a first
Replies: 22
Views: 2895

Re: This must be a first

Just to clarify, as the topic starter, I wouldn't recommend this purchase... The risk is if the plastic is a bit too pliant, a rider might find themselves unable to clip out. That's the worst case scenario. It's ridiculously cheap even compared to buying from Aliexpress or eBay. But I think it's jus...