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Re: DIY microchips

 by DakLak ¦  Mon Feb 13, 2017 10:26 am ¦  Forum: New Product Ideas ¦  Topic: DIY microchips ¦  Replies: 4 ¦  Views: 2060

There are a few sources in China who will build your requirements using their range of die. You design your requirements from there library of functions and the will happily bang out batches of 500 pieces. They take they die you have selected, stick them on a substrate, then hook the die pads to eac...

LiPo Battery Pack / Multi-Cell Balancers~Chargers

 by DakLak ¦  Mon Feb 13, 2017 10:18 am ¦  Forum: New Product Ideas ¦  Topic: LiPo Battery Pack / Multi-Cell Balancers~Chargers ¦  Replies: 1 ¦  Views: 1012

Why only a single Balancer-Charger for LiPo batteries in your store? The unit should be capable of a minimum of FOUR CELLS as a maximum, EIGHT CELLS would be good. - many D-I-Y projects use 19-24V packs . It would be a good project for your range of components, too. Only the PCB would be required as...

Re: RF Technology For Detecting Presence Within 5-10' of Rea

 by DakLak ¦  Mon Feb 13, 2017 9:58 am ¦  Forum: Wireless/RF ¦  Topic: RF Technology For Detecting Presence Within 5-10' of Reader? ¦  Replies: 2 ¦  Views: 1474

The lowest bands RFID tags operate in are 125Khz & 13MHz. There are also 'key fob' tags for users. Lower frequency equates to greater distance. A decent antenna is also a requirement. I am familiar with a 125Khz system in an airport which is good for interacting with tags 15+ feet away. All RFID sch...

Re: RF pair in UAV

 by DakLak ¦  Mon Feb 13, 2017 9:39 am ¦  Forum: Wireless/RF ¦  Topic: RF pair in UAV ¦  Replies: 3 ¦  Views: 1309

Adding features often means adding weight and therefore it is preferable to make the enhancements on the ground. This assumes you have considered GPS 'come home' which only require minor increases in UAV weight and added software. If you wish a simpler system consider tracking-type or treasure hunt ...

Re: Modules from DIYmodules

 by DakLak ¦  Mon Feb 13, 2017 9:13 am ¦  Forum: PCB Design Questions ¦  Topic: Modules from DIYmodules ¦  Replies: 4 ¦  Views: 2124

It is common, when PCB authors wish to maintain confidential information, to prepare FAB materials that disclose no component information or PCB names - using part numbers only. We use one FAB shop for prototypes which offers 24-hour turnaround as standard. They will accept almost any form of data f...

Re: Help (EVK3): opening the solder jumpers, what does that

 by DakLak ¦  Mon Jun 17, 2013 1:45 am ¦  Forum: SparkFun Product Questions ¦  Topic: Help (EVK3): opening the solder jumpers, what does that mean ¦  Replies: 1 ¦  Views: 490

The word 'OPEN' when applied to electronics is usually meant to infer an 'OFF' condition by (1) 'Opening' a switch; (2) Breaking a connection, i.e. opening a 'hole' in a circuit. In the case of PC tracks it means cutting a track, which is sometimes a technique used as opposed to a jumper or switch. ...

Re: Help with batteries and Charger Circuit

 by DakLak ¦  Sun Jun 16, 2013 5:32 am ¦  Forum: SparkFun Product Questions ¦  Topic: Help with batteries and Charger Circuit ¦  Replies: 1 ¦  Views: 689

First, messing with batteries can cause fires. Ask Boeing. To INCREASE VOLTAGE , you connect batteries in SERIES . To INCREASE CURRENT capacity (amps) you connect batteries in PARALLEL . BUT there are other precautions needed. If you look at the schematic of the Big Easy < http://dlnmh9ip6v2uc.cloud...

Re: Is it possible to fast charge a USB device, while using

 by DakLak ¦  Sun Jun 16, 2013 4:41 am ¦  Forum: SparkFun Product Questions ¦  Topic: Is it possible to fast charge a USB device, while using data ¦  Replies: 2 ¦  Views: 468

The USB specification limits power to 500 mA. And often equipment supplies less than that. Your best best is to use an adapter to provide the power. You would have to separate the power from the equipment and the power from the adapter to avoid damage. If you look at < http://upload.wikimedia.org/w...

Re: Trying to understand how Laser Range Finders work

 by DakLak ¦  Sat Jun 15, 2013 10:32 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Trying to understand how Laser Range Finders work ¦  Replies: 163 ¦  Views: 64117

I know this string is somewhat dormant but I thought I would throw my two bits in anyway. I have been building a water-borne photographic robot which 'rolls' to a specific location either under automatic (GPS) or manual guidance. All very simple, all 'same-same' circuitry. Propulsion is different, i...