Archive for April, 2008
2008 April circuits - related electronic projects and circuit diagrams (schematics), this helps you finding desired informations and facilitates your site navigation through all articles database.
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STK4241V datasheet specifications
Apr 29th
STK4241V Thick Film Hybrid IC AF Power Amplifier (Split Power Supply) (120W+120W min, THD = 0.08%). Features • Muting circuit built-in to isolate all types of shock noise • Current mirror circuit for low 0.08% total harmonic distortion • Pin compatible with the STK4201II series (THD = 0.4%) and the STK4141X series (THD = 0.02%) (more…)
4060 datasheet
Apr 29th
The 74HC/HCT4060 are high-speed Si-gate CMOS devices and are pin compatible with “4060” of the “4000B” series. The 74HC/HCT4060 are 14-stage ripple-carry counter/dividers and oscillators with three oscillator terminals (RS, RTC and CTC), ten buffered outputs (Q3 to Q9 and Q11 to Q13) and an overriding asynchronous master reset (MR). (more…)
Presence detector, proximity sensor circuit
Apr 28th
This circuit react in presence of any conductor object including humans. This circuit does not detect object movement but can act as an proximity sensor! Sensitivity is adjustable with P1 which will be located at a great distance from the rest of the presence detector circuit. (more…)
Liquid detector, water sensor
Apr 27th
This is a very simple liquid detector that use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use any PNP transistor that can stand the relay current. Check out the new water level sensor circuit. (more…)
Mini drill revolutions, speed regulator circuit
Apr 27th
With the help of this revolution regulator circuit you can control the number of revolutions of your drilling machine. After you finish construct this mini drill revolution regulator measure the output voltage. First rotate P2 to the right completely, P1 to the maximum. Now the measured voltage must be 20% less than the maximum allowed motor voltage. If it isnt then R1 must be lowered or increased. After this connect the drilling machine. P1 must pe on the middle position. P2 is adjusted that the motor revolutions doesnt increase. The optimum adjustement is when at the maximum drill motor load the More >
Stabilized adjustable power supply 0-15V / 5A
Apr 27th
This regulated power supply can be adjusted between a few volts and 15V with P1 and with P2 adjust the upper limit ( 15.0V ). R6 value is 0.7V / Imax where Imax is the maximum current. At Imax = 5A, R6 is 0.14Ω T1 and T2 must have heatsinks because power losses are great at a low output voltage and a Imax equal current but you can connect the lamp L to reduce this losses. I’ve build this adjustable power supply and works great! I hope you’ll enjoy it too and have fun build this great stabilized power supply. More >
Dynamic microphone amplifier – low noise
Apr 26th
This dynamic microphone amplifier circuit has a total gain of 200 times. If we use 200Ω microphones R4 must be 220Ω and C1 is 4.7uF. If you want the to get the lowest noise signal from this dynamic mic amplifier use metalic resistors for R3 .. R6 and for C1 use more MKM capacitor in parallel connection. Some specification: with a 3mVpp input signal the output was 800mVpp. The maximum output voltage was 10Vpp when the input is 50mVpp. The frequencies domain is between 50Hz and 100KHz. (more…)
Automatic Gain Control – Volume AGC
Apr 26th
The schematic we propose offers a less harmonic signal and a supplementary gain, so it get rid of those annoying variation between speech and music wich offen appears at radio and tv. This automatic gain volume control schematic need a +-15V power supply and 6mA. Bellow you get the volume agc circuit pcb, graphic and schematic. (more…)
Infrared headphones receiver
Apr 26th
Use this infrared headphones receiver with the ir headphones transmitter. Use 600Ω headphones. BPW41N and BP104 have a filter for visible light and are centered on 950nm at 250C. At normal light illumination and 3 to 4 meters distance the audio distorsion were 1 – 2%, wich is not bad for such a simple ir headphones receiver schematic (more…)
Infrared headphones transmitter
Apr 26th
The transmitter offers a optical link (infrared) for headphones. Three infrared leds (ir) are polirised by T1 current, P1 is used to adjust the current level . Current consumption of this headphones infrared transmitter is about 60mA at 9V. Maintain separated adapter ground and audio signal ground to prevent current reactions thru LED. The optical link is relative directional and can be improved by placing the leds in different angles and placing reflectors behind them. (more…)
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