- Very Old Sony Stereo Equipment - 1 Update
- JR611 SOIC-8 in bicycle lamp. - 6 Updates
| "Rick" <rike22@bellsouth.net>: Nov 05 03:41AM -0600 "OldGuy" <spamnot@nospam.com> wrote in message news:n1b6al$234r$1@adenine.netfront.net... > -- > No signature > --- news://freenews.netfront.net/ - complaints: news@netfront.net --- On E-bay search for "wire glue". The little $5.95 bottles work well. in the description scroll down to keypad repair. Been using this for years. |
| "Ian Field" <gangprobing.alien@ntlworld.com>: Nov 04 06:36PM Its a long shot, as its probably a house coded part. Its a Crivit Sport LED bicycle lamp from the Lidl discount store. Originally it was the LED that went intermittent, but when a second unit died I decided I could spare one to experiment on. Suitable LED parts are on order from Ebay, but I thought I'd have a go at upgrading it with a switch mode current control. The circuit is ready, but I need to identify the "glue logic" type stuff on the PCB. The on/off button is a simple pushbutton, the latching is done electronically. It also has a low battery warning LED - these features would be nice to retain, but I need a little help identifying the stuff on the board. Thanks. |
| N_Cook <diverse@tcp.co.uk>: Nov 04 06:57PM On 04/11/2015 18:36, Ian Field wrote: > would be nice to retain, but I need a little help identifying the stuff > on the board. > Thanks. Have you isolated and powered each power LED from a bench ps? |
| "Ian Field" <gangprobing.alien@ntlworld.com>: Nov 04 07:21PM "N_Cook" <diverse@tcp.co.uk> wrote in message news:n1dk9m$5ks$1@dont-email.me... >> on the board. >> Thanks. > Have you isolated and powered each power LED from a bench ps? Replacing the LED chip fixed the intermittent fault, so that pretty much eliminates the circuit on the PCB. But While I'm working on it - I'd like to upgrade it with SMPSU technology. |
| N_Cook <diverse@tcp.co.uk>: Nov 04 09:08PM On 04/11/2015 19:21, Ian Field wrote: > Replacing the LED chip fixed the intermittent fault, so that pretty much > eliminates the circuit on the PCB. > But While I'm working on it - I'd like to upgrade it with SMPSU technology. Adding some extra heatsinking would not go amiss |
| "Ian Field" <gangprobing.alien@ntlworld.com>: Nov 04 09:14PM "N_Cook" <diverse@tcp.co.uk> wrote in message news:n1ds0h$5s5$1@dont-email.me... >> But While I'm working on it - I'd like to upgrade it with SMPSU >> technology. > Adding some extra heatsinking would not go amiss The whole point is to reduce dissipation - not disguise it. The LED rating is no less than 1W and the bicycle lamp specification only claims 0.6W - the LED barely gets warm. |
| whit3rd <whit3rd@gmail.com>: Nov 04 02:48PM -0800 On Wednesday, November 4, 2015 at 11:21:25 AM UTC-8, Ian Field wrote: > > On 04/11/2015 18:36, Ian Field wrote: > >> Its a long shot, as its probably a house coded part. > >> Its a Crivit Sport LED bicycle lamp from the Lidl discount store. ... > >> at upgrading it with a switch mode current control. > Replacing the LED chip fixed the intermittent fault, so that pretty much > eliminates the circuit on the PCB. I'd worry about the light distribution from a replacement LED; an eBay item usually doesn't have a good angular distribution specification... > But While I'm working on it - I'd like to upgrade it with SMPSU technology. There are some chips that do this; generally, though, it's going to be a small-outline surface mount part, and will only work from a limited voltage input range. This is a typical such part: <http://www.micrel.com/_PDF/mic3289.pdf> which, as I read it, is suitable for three alkaline cells in series (4.5V nominal). If you are going to have a switchmode supply, it's most efficient to boost voltage (the switches and diode have lower losses at lower current) and use multiple LEDs in series. |
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