Questions tagged [cost]
The cost tag has no usage guidance.
75
questions
1
vote
1
answer
47
views
Simultaneously usage and effect on electric cost [closed]
Will using 2 watt devices simultaneously result in a higher electric bill than the same 2 if used at different times but for the same length of time (ie, 2 water fountain pumps together for 12 hours ...
2
votes
2
answers
136
views
Is there something like a banana plug that will fit in a 30mil or 50mil through hole test point?
I am developing a cost sensitive product. The printed circuit boards need to be programmed and tested. It seems like a waste of money to put a programming/test connector on the board just to use it ...
- 12.4k
-4
votes
3
answers
487
views
How do I know how much a kWh costs me if I have my private generator [closed]
I have a 10 kVA generator and its efficiency is approx. 90%
How can I know the cost of a kWh?
Estimate the price of diesel as $2.5 a liter.
- 13
2
votes
2
answers
150
views
Copper fills in top and bottom layer from a cost perspective
I've seen low-cost boards from consumer electronics that have just tracks connecting the pins and they will have no copper ground pours. Since making these as cheap as possible is the goal, doesn't it ...
- 31
0
votes
2
answers
1k
views
How to calculate the cost of charging a portable power station?
Can I calculate the cost of charging my portable power station based on the specs for the charge adapter? For example, the adapter shows it rated at 15V @ 3A, and it takes 5 hours to charge. Does that ...
- 11
3
votes
2
answers
253
views
Is there an affordable way to balance a bridge without using expensive resistors?
I have a full and balanced bridge circuit with four through-hole \$ 350 \,\Omega \$ resistors and an instrumentation amplifier AD8293G80 that has a gain of 80. Both the bridge and the amplifier are ...
- 1,428
3
votes
1
answer
231
views
Selecting larger inductors than necessary for cost optimization
I'm designing a board that I want to initially manufacture using JLCPCB for both the board fabrication and assembly. The pricing approach at JLCPCB separates available components into commonly used &...
- 362
2
votes
0
answers
74
views
What's the cheapest way to design this circuit?
I design a board with Power over Ethernet (PoE 802.3af/at) and the standard requires a "Maintain Power Signature" (MPS) signal, which is a 10 mA, 75 ms pulse every 325 ms (roughly 25 % D.C.)....
- 31
3
votes
4
answers
2k
views
Resistor switching methods
I have an application where I need to measure the voltage drop over a resistor that varies between 10 ohm - 50 kohm. As I have this set up as a voltage divider, with the result being read by an AtoD, ...
- 12k
1
vote
2
answers
914
views
Is energy consumption of the 3kw kettle lower than 2kw kettle? [closed]
On the market there are 2kw 1.7 liter kettles and also 3kw 1.7 liter kettles.
I understand that bringing the same quantity of water to the same temperature require same amount of energy, but from the ...
- 113
2
votes
0
answers
99
views
Large variations in capacitor cost
I am very surprised with difference in capacitor cost (up to 10 times) like this and this.
These two have same capacitance along with voltage rating and tolerance level.Then what are the reasons ...
- 123
6
votes
4
answers
991
views
Low cost connector for 500 connection points, of which only a few are used at any time
So, I've been asked to make a GAL-like PCB that can be 'manually programmed' without need of soldering for an educational setting.
Meaning, I have signals coming in ('horizontally') that can be linked ...
- 121
0
votes
1
answer
40
views
Cheapest way to power an LED from an Android phone using Bluetooth [closed]
I recently wanted to make an Android controlled LED using Bluetooth.
The obvious solution I could think of is using a HC-05/06 module with an Arduino.
However I believe for just lighting an LED, this ...
- 103
5
votes
2
answers
515
views
Understanding relation between energy use, watts and amps
I'm looking into air conditioners and I've been unable to fully understand the relation between watts, amps and the energy ratings (in this case, the one used in the United States, the yellow Energy ...
- 161
1
vote
1
answer
521
views
Instrumentation amplifier, discrete or integrated?
Since integrated instrumentation amplifiers are so readily available, does it still make sense to incorporate an instrumentation amp discretely built from multiple opamps and resistors? Would one see ...
- 489