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Hits:496 Power supplies
The majority of children's electric toy works from galvanic cells and batteries. So often there comes a time when the energy source supply runs low, and no new…
Read moreHits:1156 Shortwave antenna
The antenna is designed for dual-band for radio SN-258. The adjustment is performed by moving the short-circuit jumper for minimum SWR. Author: V. Vasilenko; Publication: N. Bolshakov, rf.atnn.ru
Read moreHits:550 Indicators, detectors
There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/high indicator is desirable. A battery charge…
Read moreHits:837 Audio
DescriptionThis circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the…
Read moreHits:1103 Audio
Circuit diagramPOWER OUT -3W/8 ohm - 1KHZINPUT SENSIV.- 600mV for 2WDISTROTION -3%FREQUENCY RESPONSE - 22HZ-50KHZ -3dBS/N -90dBPart ListR1= 22KohmR2-3= 1KohmR4-5= 1.5KohmR6-7= 470KohmR8-9= 1Kohm 2WRV1= 250Kohm Log. pot.C1-7-9= 100nF…
Read moreHits:830 Clocks, timers, relays, load switches
Sometimes in radio Amateur practice problems with commutation powerful network loads. Examples include nodes switching to reversing three-phase motors, starting devices of different machines, water heaters etc., electro-mechanical switches for…
Read moreHits:905 House, garden land, hobby
This electronic game pits a human player against the ‘machine’. The opponents use a common ‘game token’ and take turns moving along a path by one, two or three steps…
Read moreHits:780 Audio
This is a inexpensive high fidelity (hi-fi) tone control circuit designed just with two low cost transistors as the active components. The schematic is one channel (mono) tone control, build…
Read moreHits:488 Lighting
Astonishing effect4.5V supplyCircuit diagramParts:R1,R2 4K7 1/4W ResistorsR3 22K 1/4W ResistorR4 2M2 1/4W Resistor (See Notes)R5 10K 1/4W ResistorR6 47R 1/4W Resistor (See Notes)C1 1µF 63V Polyester CapacitorD1 5mm. Red LED…
Read moreHits:663 Power supplies
Here is the circuit of a simple electric window charger. With a couple of minor circuit variations, it can be used as an electric fence charger too. A standard 12V…
Read moreHits:890 Electronic fuel injection
Photo 1 shows TPS (2112-1148200) with the remote cover. Being mounted on the car "VAZ 2110" (which is equipped with injection system BOSCH M1.5.4"), this sensor has served about 4500…
Read moreHits:420 Other
This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a…
Read moreHits:623 Generators, heterodynes
The proposed generator of radio frequency signals (RF) can be used to settings antennas Amateur radio stations. It will be helpful in establishing receiving and transmitting equipment.Hams for "quiet" settings…
Read moreHits:948 Audio
The following circuit is tube distortion pedal for guitar effect. The circuit designed by Ron Black.Circuit Notes:IC1 : 747 dual op-amp, other ICs may be substitued but pinout will different…
Read moreHits:803 Power supplies
AC adapter with damping capacitor (Fig. 1), in fact, there is a voltage divider, whose upper shoulder - capacitor, and the bottom is a complex non-linear diode-resistance-capacitor circuit. This defined…
Read moreHits:645 Lighting
The proposed device responds to light. It is convenient to use as a simple "guard" in the basement with no Windows or somewhere in the utility room (the shed).If in…
Read moreHits:1372 Power supplies
For high power amplifier audio frequency power supply needed, usually having either bipolar output with an average point or two galvanically not connected output. The output voltage is almost not…
Read moreHits:2422 Power supplies
Now the house has a lot of small equipment that requires constant power. This watch with led indication, and thermometers, and small receivers, etc., In principle, they are designed for…
Read moreHits:794 Other
About the microwaveIn fact, the cooking method remains the same to heat the pot or pan and therefore its contents. To wait quite a long time, while still a huge…
Read moreHits:471 Television and video
Cable television network broadcast live programs not only the MB channels, but the cable sub-bands. A simple way of accepting them on old TVs says the author of a published…
Read moreHits:721 Power supplies
DescriptionThe LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current sharing is established with a…
Read moreHits:594 Power supplies
Very useful add on for Single output power supplyHere is the simple virtual ground circuit based on discrete components. This simple design comes from miniaturization guru Sijosae. Is to make…
Read moreHits:788 Power controllers, thermometers, heat
K. Smolyakov from Nizhny Novgorod, took the repetition of regulators the description in [1], has managed to combine in one device and two to create the device capable of handling…
Read moreHits:734 Power supplies
When running 12V electronic devices from lead-acid battery banks, the voltage to the appliance can vary from below 11V with discharged batteries, to well above 14V during charging. Many appliances…
Read moreHits:906 Audio
DescriptionIt's based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really…
Read moreHits:568 Clocks, timers, relays, load switches
In schemes with a powerful load and high switching frequency to change electromagnetic relays and starters came power semiconductor switches with optical isolation. Currently there are devices allows them to…
Read moreHits:586 Lighting
DescriptionThis circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the…
Read moreHits:680 Lighting
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplate control the firing…
Read moreHits:1822 VHF antenna
While in Genoa, I met Gianni (5N0EIB) who works in the Nigerian capital. In a private conversation Gianni told me the following amusing story.Working for one of the positions in…
Read moreHits:626 Clocks, timers, relays, load switches
The device can be used as a useful additional attachment to any stationary audio amplifier and allows in the absence of the signal on the output load (the…
Read moreHits:601 Television and video
When repairing TVs of radiomekhaniki and ham radio operators are often faced with problems replacement elements (not in the sale) and blocks (for the purpose improve the reliability of the…
Read moreHits:612 Lighting
When shooting at close range fotoreproduktsy, exhibits energy industrial "blitzes" is often unnecessarily large and, in addition, the use of troubling others. In such cases it would…
Read moreHits:626 Indicators, detectors
In radio Amateur practice there is often a situation when it is necessary to track the readings of each option. Propose a scheme indicator led rulers. Depending on the input…
Read moreHits:587 Power supplies
Chizhevsky chandelier repeatedly been described in various publications. Your attention an efficient supply circuitry Chizhevsky, which is depicted in Fig. 4.62. The transformer T1…
Read moreHits:2950 Television and video
Rhu (block of video heads or the rotating head unit) can be considered the main hub of any VCR or camcorder. Author of published article talks about his design, classifies…
Read moreHits:652 Audio
Agreeable, very close sound imitation, Suitable for sound effects, door-bells etc.This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other…
Read moreHits:628 Telefonie
A small refinement of the phone with a carbon microphone according to the scheme in Fig. 1 will save owners from strong interference in the form of cod due to…
Read moreHits:1081 Shortwave antenna
When establishing a shortwave antennas you can use the meter response (X1-19B, X1-7B). Its output is connected to the input via the RF head (Fig. 1), and the connection…
Read moreHits:1457 Lighting
This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be adjust with the range of 1Hz to 5Hz. You can use the PR1 variable…
Read moreHits:2676 VHF antenna
Antenna "Slim Jim" proposed G2BCX for the range of 144 or 430 MHz, has a gain of about 3 dB compared to a half wave dipole. Antenna power is 75…
Read moreHits:519 Lighting
DescriptionThis circuit is similar to the "Fading Red Eyes" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by…
Read moreHits:572 Audio
circuit diagram Parts:P1 2K2 Linear PotentiometerR1,R2,R3 100K 1/4W ResistorsR4 8K2 1/4W ResistorR5 68R 1/4W ResistorR6 6K8 1/4W ResistorR7,R8 1K 1/4W ResistorsR9…
Read moreHits:1094 Electronic devices
Our industry produces a stroboscopic devices: car strobe STB-1 (Fig. 1) and the device Auto-spark" (Fig. 2), used to check and adjust the ignition timing on the car.Know how important…
Read moreHits:526 Electronic devices
Who among motorists who have electroacoustical headlights, unknown unpleasant phenomenon, when the brush is frozen, and the engine starts (whether casually or when you turn on the windshield wiper when…
Read moreHits:1051 Other
This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port. The circuit is extremely simple. IC1 provides buffering for the signals that travel from…
Read moreHits:456 House, garden land, hobby
DescriptionIf you’re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone…
Read moreHits:709 Shortwave antenna
Portable antenna The antenna is made of copper wire with a diameter of 2.5 mm and a length of about 45 cm Coil L1 contains 5.5 turns (step 5.5 mm)…
Read moreHits:1144 House, garden land, hobby
In the logs shows a lot of schemes for independent the manufacture of similar utility devices, however, as experience shows, the greatest difficulty in the manufacture of such…
Read moreHits:725 Indicators, detectors
The proposed device, the led indicators (see figure) allows a sufficient degree of accuracy to show the voltage on the power source, consisting of two batteries or battery cells.On fully…
Read moreHits:518 Audio
High Quality simple design, No need for a preamplifierThis is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It…
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