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     2  +1 2014 sep 11555 timer calculator555 Timer Calculator - Bowden's Hobby Circuits555 Timer - Frequency and Duty Cycle Calculator . Enter values for R1, R2, and C and press the calculate button to solve for positive time interval (T1) and ...
     2  ~ 2014 aug 28binary clock schematicBinary Clock - Bowden's Hobby CircuitsThe clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that ...
     2  -1 2014 aug 18hobbyist generator circuitBowden's Hobby Circuits100+ small circuit diagrams for the hobbyist or student. ... In-Use LED Indicator · Telephone In-Use Relay Circuit · Telephone Ring Generator Using 60Hz Power ...
     3  +1 2014 sep 28rc5 decoder picPhilips RC5 IR Decoder - Bowden's Hobby CircuitsRC5 code (lower picture) = address 0, command 9 - TV digit '9' ... RC5 code is sent twice or more with 114mS spacing and the PIC program takes ...
     3  ~ 2014 aug 26prallel port relay interfaceParallel Port , Lamp Faders, RF Transmitters - Bowden's Hobby CircuitsParallel Port Relay Interface . Below are three examples of controlling a relay from the PC's parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay ...
     3  ~ 2014 jul 16bill bowden laser repairBill Bowden's Hobby CircuitsSamuel M. Goldwasser Homepage - Silicon Sam's Technology Resource - FAQs, Links, Troubshooting & Repair , Laser info, Circuits. Deep Cycle Battery ...
     4  -3 2014 jul 28hobby electronic circuitsA small collection of electronic circuits for the hobbyist or student. Site includes 100+ circuit diagrams with text descriptions, several electronic calculators, links to ...
     6  +5 2014 aug 25time delay relay circuitElectronic Thermostat and Relay Circuit - Bowden's Hobby CircuitsHere's a power-on time delay relay circuit that takes advantage of the emitter/ base breakdown voltage of an ordinary bi-polar transistor. The reverse connected ...
     6  +11 2014 aug 18time delay circuitPower-On Time Delay Relay Circuit - Bowden's Hobby CircuitsIn this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current  ...
     6  +3 2014 jul 30led series calculatorLED Series Resistor Calculator - Bowden's Hobby CircuitsUse the calculator below to determine the series resistor needed to connect various series combinations of light emitting diodes or " LEDs ". LED voltages vary  ...
     7  -1 2014 aug 20voltage divider calculatorVoltage Divider Calculator - Bowden's Hobby CircuitsThe Java calculator below can be used to solve the unknowns associated with the voltage divider at the right. The output at "Vout" represents the voltage across  ...
     8  +7 2014 aug 12ohms law calculatorOhms Law Calculator - Bowden's Hobby CircuitsOhms Law Calculator . Enter any two known values and press "Calculate" to solve for the others. For example, a 100 watt light bulb operating on 120 volts AC will ...
     8  -1 2014 jul 29op amp power supplyOp - Amp Basics - Bowden's Hobby CircuitsThe op - amp is usually powered by a dual polarity power supply in the range of +/ - 5 volts to +/- 15 volts. A simple dual polarity power supply is shown in the ...
     10  -4 2014 aug 27electronic hobby boardA small collection of electronic circuits for the hobbyist or student. .... schematic capture, printed circuit board design/layout, autorouting, circuit simulation, SPICE , ...
     10  -1 2014 aug 14electronics hobby projectsA collection of electronic circuits for the hobbyist or student, links to related sites, commercial kits and projects , newsgroups and educational areas.
     10  -1 2014 jul 16op amp basicsOperational Amplifier ( Op - Amp ) Basics . The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output ...
     11  +3 2014 sep 21led calculatorUse the calculator below to determine the series resistor needed to connect various series combinations of light emitting diodes or "LEDs". LED voltages vary  ...
     12  -4 2014 sep 23555 switchCircuits Page 9 - Bowden's Hobby CircuitsHigh Current MOSFET Toggle Switch with Debounced Push Button. This circuit ... This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 ...
     12  +1 2014 sep 21led resistor calculator
     12  -1 2014 aug 08resistor calculator for leds
     14  +1 2014 jul 17resistnce for led
     15  -1 2014 sep 05camera timer circuitsAlso contains a pictorial diagram of the timer connected as a LED flasher and a ... From AM & FM Transmitters, Hobby Kits, Video Cameras , Time & Weather ...
     15  -1 2014 jul 28telephone billing system circuits100+ small circuit diagrams for the hobbyist or student. ... PIC Security System Dials Your Cell Phone · Use Old Telephones as Intercom · Telephone In-Use LED ...
     16  +6 2014 aug 29relay to parallel portFigure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state relay  ...
     18  -1 2014 aug 23led current calculatorTo find the series resistor needed, enter the total number of LEDs, the individual LED voltage (1.6 to 4.5), the desired current (normally 10 to 20 mA) and the total  ...
     18  +5 2014 aug 14hobby in electronics
     18  -1 2014 jul 25transistor audio amplifier circuit3 Transistor Audio Amp - Bowden's Hobby Circuits3 Transistor Audio Amp (50 milliwatt). Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the ...
     20  +76 2014 sep 09laser diode shd ttlThe conducting transistor can be turned off by grounding it's base through the push
     23  +1 2014 aug 30the porta-pulse dialerPIC Security System Dials Your Cell Phone - Bowden's Hobby CircuitsThe circuit uses the pulse dialing system to interrupt the line connection a ... But I elected to use 3 consecutive I/O pins (7,8,9) of the 8 bit port B and leave RA5 ...
     25  +2 2014 sep 122n3055 single transister ocilatorMisc - Bowden's Hobby CircuitsThe 2N3055 and 2N3053 transistors should be mounted on suitable heat sinks ... a Schmitt trigger oscillator is used to drive a switching transistor that supplies ...
     26  +3 2014 sep 13ohms lawEnter any two known values and press "Calculate" to solve for the others. For example, a 100 watt light bulb operating on 120 volts AC will have 144 ohms of ...
     26  +11 2014 sep 11timer switch circuitThis circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John ... This 555 timer circuit below toggles a relay when a button is pressed.
     26  +4 2014 sep 09hobbyist generator coils
     26  +6 2014 aug 31555 circuitsEnter values for R1, R2, and C and press the calculate button to solve for positive time interval (T1) and negative time interval (T2). For example, a 10K resistor ...
     26  -2 2014 jul 22digital clock schematicPIC Digital Clock Timer - Bowden's Hobby CircuitsNote: There is a bug in this program that prevents the alarm from working if the minutes are set to zero. So, an alarm setting of 8:59 or 6:01 will work but 6:00 will  ...
     29  -5 2014 aug 27electronic circuits diagrams
     29  -8 2014 aug 17variable voltage regulator circuitTelephone In-Use Relay, LM317 Regulators , Lithium ChargerThe LM317T is a adjustable 3 terminal positive voltage regulator capable of ... Output voltage is set by two resistors R1 and R2 connected as shown below.
     29  -14 2014 jul 23reley timer offThe power supply is gated off during the discharge time so that the SCR will stop conducting and return to it's blocking ... 9 Second LED Timer and Relay Circuit.
     30  ~ 2014 sep 26voltage divider
     30  +4 2014 aug 31led lights hobbyLinks to Other Hobby Electronics Sites and Useful Information. Hobby Projects to Build, That Work ... LED lamps, light bulbs, clusters and lighting components.
     31  +19 2014 oct 02load time calculatorRC Time Calculator - Bowden's Hobby CircuitsRC Time Calculator . In the drawing at the left, the time required for the capacitor to charge to 63.2% of the battery voltage after the switch is closed is the product ...
     31  -7 2014 aug 03led circuit diagram100+ small circuit diagrams for the hobbyist or student. ... Also contains a pictorial diagram of the timer connected as a LED flasher and a table of connections for ...
     32  +4 2014 oct 03free electronic circuits100+ small circuit diagrams for the hobbyist or student. ... Tony's Website - Free electronic circuits , R/C Gadgets, and tutorials for the hobbyist. Site in operation ...
     33  +11 2014 sep 01mechanical wall clocksQuartz Crystal Controller for Mechanical Wall Pendulum Clock "Quartz Crystal Synchronizer for Pendulum Windup Wall Clock . Mechanical Clock Project: Last year, I found a 31 day pendulum wall clock  ...
     35  +28 2014 oct 03crystal oscillator circuit1 Second Time Base From Crystal Oscillator - Bowden's Hobby The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base. Two cascaded 12 ...
     35  +37 2014 aug 30momentary switch circuitThis circuit was adapted from the "Toggle Switch Debounced Pushbutton" by ... Any number of momentary (N/O) switches or push buttons can be connected in ...
     36  -14 2014 jul 28electronic hobby kits storeA small collection of electronic circuits for the hobbyist or student. .... Electronic Kits Store Offering a wide range of educational electronic kits , robotics kits , and ...
     37  +12 2014 sep 27ohms
     37  -16 2014 sep 252n3055 single transistor oscillator
     37  -2 2014 aug 28new digital clock circuitsA small collection of electronic circuits for the hobbyist or student. ... What's New Here? .... 555 Timer - Frequency and Time Interval Calculator - Calculates positive and negative time intervals for the 555 timer based on R and C values.
     40  +15 2014 sep 13led electronics kitsAlso contains a pictorial diagram of the timer connected as a LED flasher and a ... Ramsey Electronic Kits Ramsey Electronics ® has been providing the neatest ...
     40  +23 2014 aug 28digikey ti icusing common components available from Radio Shack, Digikey , Jameco, Mouser, ... PIC Security System Dials Your Cell Phone · Use Old Telephones as ...
     43  +14 2014 aug 18variable voltage regulatorLM317T Variable Voltage Regulator . The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output ...
     44  -6 2014 sep 19ir switchIR Receiver Toggle Switch - Bowden's Hobby CircuitsIR Receiver Timing Diagram. The IR receiver circuit featured here is basically a simple toggle switch that responds to IR signals from common hand held remote  ...
     44  +15 2014 aug 21decimal time clockBinary Coded Decimal (BCD) Clock - Bowden's Hobby CircuitsThe clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time . The LEDs can be arranged (as shown in example above) so that ...
     44  -6 2014 aug 01electronic hobby kits suppliesA small collection of electronic circuits for the hobbyist or student. Site includes .... components . JDR Microcontrollers Books, Kits , Test Equipment and more.
     47  -1 2014 sep 09resistor calculator
     47  -11 2014 aug 20resistor color code calculatorResistor Color Code Intrepreter - Bowden's Hobby CircuitsTo determine the value of a resistor from the color band markings, hold the resistor ... The calculator below can be used to determine the equivalent value of two ...
     47  -28 2014 aug 19rf electronic circuit diagrams100+ small circuit diagrams for the hobbyist or student. ... Site includes 100+ circuit diagrams with text descriptions, several electronic ... Analog / RF Circuits.
     48  -8 2014 jul 30battery pulse current capacitorBattery Equal Charge Indicator - Bowden's Hobby CircuitsAs the pulse train occurs, the 4.7uF capacitor is charged to about 3 volts and the ... The collector current of the first stage flows into the base of the output ...
     50  +36 2014 sep 06lip flop ledThis is an example of a set/reset flip flop using discrete components. ... Note that in the LED circuit, the base current from the conducting transistor flows through ...
     50  +51 2014 aug 21parallel port switchFigure A shows a solid state relay controlled by one of the parallel port data lines ... Each switch input represents a decimal value of 8,16,32,64 and 128 which ...
     50  +23 2014 jul 30miniature switch battery circuit100+ small circuit diagrams for the hobbyist or student.
     51  -14 2014 aug 29resonance frequency calculatorL or C Reactance Calculator - Bowden's Hobby CircuitsEnter any two known values and press " Calculate " to solve for the others. For example, a 1 uF ... Resonant Frequency (Fo) = 1 / ( 2 * Pi * SquareRoot(LC) ) ...
     51  -26 2014 jul 29electronic serkit diagrms
     52  -6 2014 jul 30variable power supply circuit24 Volt / 3 Amp Power Supply - Bowden's Hobby CircuitsVariable 3 - 24 Volt / 3 Amp Power Supply . This regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be  ...
     52  ~ 2014 jul 17transistor amp schematicImproved 3 Transistor Audio Amp (80 milliwatt). This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker.
     54  -28 2014 jul 31led light circuit diagram100+ small circuit diagrams for the hobbyist or student. Site includes, text ... LED lamps , light bulbs, clusters and lighting components. JDR Microcontrollers ...
     56  -7 2014 aug 10ttl logic levelsControlling Relays with Logic signals. - Bowden's Hobby CircuitsControlling a relay with a digital logic level . ... 74XX refers to standard TTL logic, 74LSXX refers to low power TTL logic, 74HC is high speed CMOS and CD40XX  ...
     57  -26 2014 aug 28hobbyist electronic componentsA small collection of electronic circuits for the hobbyist or student. ... Most of the circuits can be built using common components available from Radio Shack, ...
     57  -7 2014 aug 15op amp circuitsOperational Amplifier ( Op - Amp ) Basics - Bowden's Hobby CircuitsThe op - amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output impedance. The op - amp has a "inverting" ...
     57  +44 2014 aug 11current regulator circuitThe LM317T is a adjustable 3 terminal positive voltage regulator capable of ... The LM317T output current can be increased by using an additional power ...
     58  -11 2014 aug 29recipe divider calculatorVoltage Divider Calculator - Solves voltage, current, and power dissipation ... Wonton Soup Recipe This recipe was copied from a local Chineese take out place.
     58  -16 2014 jul 28resistor standard valuesTo determine the value of a resistor from the color band markings, hold the ... Resistor 5% Standard Values : 1.0 10 100 1.0K 10K 100K 1.0M 10M 1.1 11 110 ...
     58  +19 2014 jul 28miniature battery switch circuit
     58  +2 2014 jul 19led circuit design100+ small circuit diagrams for the hobbyist or student. ... LED Circuits ... back book " Design of Active Filters, With Experiments" by Howard M. Berlin, 1977.
     59  +4 2014 aug 19resistor colour codeTo determine the value of a resistor from the color band markings, hold the resistor so that the gold or silver band is to the right. If there are only 3 bands, hold the ...
     60  -4 2014 sep 03binary clock kitAlso may be purchased as a kit . ... PIC Digital Timer (4 timed outputs) · Binary Coded Decimal (BCD) Clock · Digital LED Clock and Timer · Astable Multivibrator  ...
     60  -19 2014 aug 20simple timer circuitNote that in the LED circuit , the base current from the conducting transistor flows through ... This 555 timer circuit below toggles a relay when a button is pressed.
     61  +40 2014 aug 07electronics led computer lightA small collection of electronic circuits for the hobbyist or student. Site includes ... Digital/ Computer .... LED lamps, light bulbs, clusters and lighting components.
     62  ~ 2014 jul 26am transmitter schematicParallel Port, Lamp Faders, RF Transmitters - Bowden's Hobby CircuitsMicro Power AM Broadcast Transmitter . In this circuit , a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor ...
     62  -4 2014 jul 21create a hobby siteSite includes, text descriptions, calculators, links to related sites , newsgroups, and ... Hobby Projects to Build , That Work Color Organ, Wattmeter, 12 volt to ...
     63  +5 2014 aug 23resistor color coding
     63  -4 2014 aug 11resistor color code
     63  ~ 2014 jul 25flip flop relaisThis is an example of a set/reset flip flop using discrete components. When power is applied, only one of the transistors will conduct causing the other to remain ...
     63  ~ 2014 jul 20salt water batteryFor use with a 9 volt battery, the incandescent lamps can be replaced with a regular .... About 13 years ago, I made a salt water battery to operate a single AA  ...
     63  -15 2014 jul 18color resistor calculator
     65  +21 2014 aug 26crystal used as clockQuartz Crystal Synchronizer for Pendulum Windup Wall Clock ... The pulse duration is about 5% of the pendulum period and a LED is used to ...
     66  -8 2014 oct 05hobby electronic kitsA collection of electronic circuits for the hobbyist or student, links to related sites, commercial kits and projects, newsgroups and educational areas.
     66  -6 2014 aug 18pararel rf amplifiresBelow are three examples of controlling a relay from the PC's parallel printer .... Input power to the amplifier is less than 100 milliwatts and antenna length is 3 ...
     66  -18 2014 jul 31resistors color calc
     69  +9 2014 sep 25audio delay line circuit diagram
     69  -37 2014 aug 28electronic circuit diagrams
     69  +11 2014 aug 19led parallel current calculatorSite includes, text descriptions, calculators , links to related sites, newsgroups
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