Soldering Iron Tip
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...
Passive volume control
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...
Seven Segment LED display
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...
Winding Transformers and Coils
i would need your help in designing transformers for rechargeable lamps. i really don’t understand what the dots in front a coil stands for. all help (including pictures) would be really appreciated. my own...
NE612 – Balanced mixer with Local Oscillator
I am designing a circuit that implements an AM radio circuit that ultilises the IC Double mixer and Oscillator NE612. I was just wondering whether there is any standard symbol for this kind of...
Resistance Measurement Analog LED Meter
This is a LED Analog Meter, This can be used as a Resistance Meter and Low Impedance Voltmeter for Battery Levels. To measure battery voltage, the R5-R12-R17 etc. part of the Reference Resistor Divider...
LM555 Voltage Doubler
This circuit shows the voltage doubler working with a 555. LM555 has good drive 200mA, both Vcc and Gnd. 555 has the advantage of having a high drive as well as being a Mixed...
FET Current Source and MOSFET
This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get...
