Fan Control - As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days. For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important.... (electronic design added 6/07)

Fan Controller Adapts to System Temperature - 09/25/97, EDN-Design Ideas:    -The circuit adjusts a fans speed according to temperature.....(design idea added 4/05)

Fan Dual-Controller - Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79. ….(design added 11/08)

Fan Timer Based on Motorola 68HC908QT2 - (electronic circuit added 6/07)

Finite State Machine Programmable Logic Controller - Finite State Machine based Programmable Logic Controller.  7 Inputs  8 Outputs  Simple IF/THEN/ELSE based compiler language generates direct EPROM files…. (add 11/05)

Fire Stick infrared Remote Control - (circuit / schematic design added 6/06)

Fluorescent Inverter - Build this 20 watt Fluoro Inverter,  it drives two 20-watt tubes or a 40-watt tube!….(electronic circuit added 04/09)

Fluorescent Lamp Inverter - This inverter is very easy to construct, reliable, and even powerful enough to light up a 15W florescent tube (if you cool your transistor well). The only hard-to-find piece of this baby is the so-called yellow inverter transformer. It's a miniature high frequency transformer that has a 25mm x 20mm x 5mm ferrite core, 30 turns of primary, 15 turns of feedback, and 250 turns of secondary all concentric, wound on plastic frame than wrapped with a 'yellow' adhesive tape. If you can't find it in your local electronic shops then search for old portable rechargeble florescent lanterns since they have at least one yellow inverter. Of course you can wind a handmade transformer which would do the same but it is a very difficult task when you don't have an original to inspire and it will still need an appropriate ferrite core. ….(design added 11/08)

Fluorescent Lamps Ballasts and Fixtures - (circuit / schematic added 5/03)

Fluorescent Light - How to build a 4-Watts Fluorescent light using a disposable camera, powered by one 1.5 Volts battery. (5/29/2006)

Fly-back Converter - (application / block diagram added 6/07)

FM Remote Speaker System - National Semiconductor Application Note  (app note added 07/08/09)

FM RF Remote Control 88-108 MHz - 1KM Range  (added 6/06)

Fogger Smoke Machine - (design circuit added 8/02)

Force/Sense Connection Eliminates Multiplexer on Resistance Error - 01/22/04, EDN-Design Ideas:  Digitally controlled gain is an everyday analog-design element. You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter. When you design digital gain control into such a converter, the usual scheme is to arrange things such that a digital multiplexer selects the appropriate feedback resistor for each gain figure....  Digitally controlled gain is an everyday analog-design element. You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter. When you design digital gain control into such a converter, the

Four Channel RF Remote Control - (electronic circuit added 4/05)

Four Way Switcher - (Schematic added 10/06)

Four Way Switcher #2 - (Electronic Schematic added 10/06)

Four-Speed Fan Control using Simple Remote Diode Temperature Sensor - National Semiconductor Application Note  (app note added 6/06)

Full Bridge Converter - (application / block diagram added 6/07)

Garden Timer with Remote control - Few years ago we control the lights in the garden with a automatic-timer-switch, very nice but when the evening gets longer or shorter we had to adapt the timer each week. In that time I came in contact with programming microprocessors so my first project was born. The first garden timer was a simple 1 output. The timing was controlled by the PIC and every month I had to change the minutes. So back to the table and design the second garden timer able to control 3 relays - left, mid and right side of the garden. It provided also 4 modes: – always off – always on – from dusk to dawn – from dusk to timer and the timing was dedicated to a RTC DS1307. ….(design added 11/08)

General Purpose Display Controller - This is a general purpose display controller for small microcontrollers. It will be used for various use because it is easy to change its configuration through using a CPLD.  (added 6/06)

GIC Resonator has Inherent Amplitude Control - 08/22/02, EDN-Design Ideas:  The circuit in Figure 1 is based on a classic GIC (generalized impedance converter). The sine-wave-oscillator circuit has inherent amplitude stabilization and normally operates from dual power supplies. However, if you connect an additional resistor, RCC, to VCC, you can operate the circuit with one supply (with VEE=0V).....(design idea added 1/05)