Search found 9 matches

by DakLak
Mon Feb 13, 2017 10:26 am
Forum: New Product Ideas
Topic: DIY microchips
Replies: 4
Views: 1876

Re: DIY microchips

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...
by DakLak
Mon Feb 13, 2017 10:18 am
Forum: New Product Ideas
Topic: LiPo Battery Pack / Multi-Cell Balancers~Chargers
Replies: 1
Views: 898

LiPo Battery Pack / Multi-Cell Balancers~Chargers

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...
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: 1411

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

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...
by DakLak
Mon Feb 13, 2017 9:39 am
Forum: Wireless/RF
Topic: RF pair in UAV
Replies: 3
Views: 1276

Re: RF pair in UAV

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 ...
by DakLak
Mon Feb 13, 2017 9:13 am
Forum: PCB Design Questions
Topic: Modules from DIYmodules
Replies: 4
Views: 2049

Re: Modules from DIYmodules

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...
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: 461

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

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. ...
by DakLak
Sun Jun 16, 2013 5:32 am
Forum: SparkFun Product Questions
Topic: Help with batteries and Charger Circuit
Replies: 1
Views: 662

Re: Help with batteries and Charger Circuit

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...
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: 454

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

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...
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: 62671

Re: Trying to understand how Laser Range Finders work

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...