This is a Sponsored Post, The contributions from these Sponsor Firms help enhance and improve the delabs websites and services. The speed controller of collector motors on the TDA1085 chip still remains popular among...
Using this circuit on Printer Port, one could drive 256 Relays or 16K LEDs as Dot Matrix display. It can be used to drive a Large size multiplexed LED dot matrix display or Latched...
This was done in my early days, i have upgraded it, it ought to work, reduce the number of transistors to make it less sensitive, also a lower value in place of 10M will...
A text chat in long ago from my email records – 2007) Jim: hello, delabs: hello Jim: i have a Small problem,it’s about relays.me: would u pls give me an information about relays,pls give...
This is dual 555 multivibrator like power oscillator. This is my contraption and conception but couple of decades old. It appears to have errors. It worked but the document fixing after design worked, not...
Can I use stainless steel to replace a defective soldering iron tip? mail from EA Soldering iron tips are mostly alloys of copper. the thermal conductivity of steel is poor. buy a soldering iron...
please if you don’t mind I need to help to find a control circuit for volume of speaker 4 ohm or 8 ohm located in the another room far away of cassette or CD...
how is the circuit for driving a seven segment led mail from EA A 7 segment LED display is used to display a number 0-9 using 7 LEDs, The circuit you design must have...
