Automatic lamp Circuit

This series will work as the lighting will automatically turn on when the voltage net PLN off. If the net voltage on the series will off automatically.

Emergency Light chain scheme can be viewed directly on the image above

search

Components list:

R1 R2 C1 D1,D2 S1 Tr1 Trafo L1,l2 Batery

: 33 Ohm : 470 Omh : 470 uF/16v : 1n4001 : switch (push on push off) : BC 160 or BC 143 : 4,5 volt 200 mA : lamp 2,5 volt : NiCd 2x1,25 volt 2-4 Ah

Series of automatic lighting unit is very simple. Voltage electricity from the net PLN revealed by transformer Tr1 and change in DC with half-wave system by dioda D1 and capacitor C1.

Next portion 6 Volt DC is used to fill the 2 Ni-Cad Battery through R1 and D2 with a continuous flow of about 100 mA (charging current to a safe a Ni-Cad battery 2 Ah).

reverse bias between the base of emitor transistors T1 obtained from the voltage fall on the D2 will make transistors T1 does not work so that lamp will be off. When voltage net PLN suppressed, T1 base transistors will be biased flow through R2, transistors T1 will work and lamp on.

When the voltage net PLN entry, transistors T1 will does not work, the lamp will be off and the battery charged through R1 and D2

search

Circuit of Mouse Repellent

A simple series of mouse repellent is a oscilator the issue on the ultrasonic wave frequency range 20 - 40 kHz. The ultrasonic waves will not be heard in the ear, but we will be with the one for the mouse ear. Base Frequency will be modulation with a 50 Hz signal is obtained from the frequency PLN through capacitor C4 (to avoid a mouse immune to it) so that the resulting swing frequency between 20 - 40 kHz periodically. Effects experienced mouse feels very good, seems like we are at a music concert with the rhythm of perplexedly ragged and could not enjoy at all. (What the human ear will not hear at all).

search

Components list:

R1 R2,R3 C1 C2 C3 C4 C5 D1,D2,D3,D4 IC1 TR1 TD1 F1

: 1 K : 15 K : 1 nF : 1 uF/16v : 100 nF : 220 nF : 1000 uF/16v : 1n4001 : LM 555 : Trafo 6v/200mA : Speaker twiter : fuse 100 mA

Heart of a series of repellent electronic mouse is a type of IC 555 that have been very popular, cheap and versatile. Use of the piezo electric loudspeaker (tweeter speaker ) so that the ultrasonic frequency is more effective. Electronic rat repellent is effective for rooms up to 200 m2 area of origin appropriate placement. Can be placed in the top corner of the room so that its frequency noise can be spread to all rooms without a hitch. Turn on continuously to ensure that the mouse does not come again.

Circuits of audio pre-Amp mic

A microphone preamp is a preamplifier used to amplify a microphone's low output voltage to a stronger, more usable level. A microphone preamp must provide stable gain for small signals without being sensitive to induced noise from cabling and without distorting large amplitude signals. Most microphones must be used in conjunction with a microphone preamp to function properly.

Simple audio Pre-Amp mic

search

This circuits use infront an RF oscilator to make an RF transmitter that is very sensitive to sound

Circuit of Power supplay

12 volt dual voltage power supplay

• Transformator 18v-CT (min)
• Capasitor 35v
• Bridge Rectifier 2 Ampere /100 v
• c4, c5 Ceramic

12 VOLT 20 Ampere power supplay


Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 20 amps.

Circuits of Audio Booster

Audio booster with transistor


The 2N3392 transistor is a (cheap) low-power, low-noise and high-gain. If you wish to use a TUN, cross reference the parameters with one of the units from this list:

Potentiometer R5 of 100K is a linear type. The value of C1 may need to be between 0.05uF and 0.1uF (47nF/100nF). Experiment with the value for best performance.
Capacitor C3's working voltage should be at least 16V.

Circuits of Infra Red Sensor

Circuit of Movement detectors


Photodioda as removing the transmitter beam infra red with the pulsation frequency 5KHz, then the pulsation will be reflection by reflector in front of it. and received by the phototransistor as the receiver. The detected object is located between the transmitter-receiver with a reflector.

Circuit on the left is the transmitter modulation circuit that produces infrared 5KHz throbbing. On the right side is the receiver circuit, there is a resonance tuned amplifier. Band width it can control so the receiver circuit can catch the beat of the transmitter modulation 5Khz. Bandwidth control is also working to reduce the sensitivity of the effect of light in the surrounding areas.

Oscillator Circuits with LM555 Chip

LM555 Astable oscillator Circuit.

Frequency of the output pulses is determined by the values of two resistors, R1 and R2 and by the timing capacitor, C.

To calculate the frequency (F):
To calculate the the On time or Off time:

Before calculating a frequency, you should know that it is usual to make R1=1 kΩ because this helps to give the output pulses a duty cycle close to 50%, that is, the HIGH and LOW times of the pulses are approximately equal.


LM555 Monostable oscillator Circuit.

A monostable, or one-shot, circuit produces a single pulse when triggered.


Trigger input is held HIGH by the 10 kΩ pull up resistor and is pulsed LOW when the trigger switch is pressed. The circuit is triggered by a falling edge, that is, by a sudden transition from HIGH to LOW. The trigger pulse, produced by pressing the button, must be of shorter duration than the intended output pulse.

To calculate the period (t):

Circuits of Audio tone control

• Bass-treble tone control circuits

Features:

Wide supply voltage range, 9V to 16V
Large volume control range, 75 dB typical
Tone control, ±15 dB typical
Channel separation, 75 dB typical
Low distortion, 0.06% typical for an input level of 0.3 Vrms
High signal to noise, 80 dB typical for an input level of 0.3 Vrms
Few external components required

Note: Vcc can be anything between 9V to 16Vand the output capacitors are 10uF/25V electrolytic.

the circuits provide some additional control over tone. They were origionally intended for use with synth modules but could be easily incorporated into most any effects circuit.

• Tree band aktiv tune control

A tone control circuit made with a single op-amp and having three ranges, bass, middle and treble controls.

Audio Ampflifier

20 Watt Audio Amplifier




Daftar Komponen:

R1 C1,C2 C3 C4 C5 C6 U1

: 39K 1/4 watt : 10 uF 25v : 100 uF 25v : 47 uF 25v : 0.1 uF 25v : 2200 uF 25v : TDA1554

• The circuit works best with 4 ohm speakers, but 8 ohm units will do.

• The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.

• The circuit operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat.

• Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.

LM386 Audio Amplifier

This simple amplifier shows the LM386 in a high-gain configuration . For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 uF capacitor. The 10k potentiometer will give the amplifier a variable gain from zero up to the maximum.

lm 3876/lm 3886 50 Watt Audio Amplifier

The 10 Ohm and 2.7 Ohm resistors must be 1 Watt types, and all others should be 1% metal film. All electrolytic capacitors should be rated at 50V if at all possible, and the 100nF (0.1uF) caps for the supplies should be as close as possible to the IC to prevent oscillation.

The supply voltage should be about +/- 35 Volts at full load, which will let this little guy provide a maximum of 56 Watts. To enable maximum power, it is important to get the lowest possible case to heatsink thermal resistance.