The document discusses several electronic circuit designs including a stereo preamplifier with bass boost, an 18W audio amplifier, and an amplified ear circuit to help hearing from far away clearly. The circuits provide details of components, schematics, technical specifications, and construction notes.
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Attribution Non-Commercial (BY-NC)
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The document discusses several electronic circuit designs including a stereo preamplifier with bass boost, an 18W audio amplifier, and an amplified ear circuit to help hearing from far away clearly. The circuits provide details of components, schematics, technical specifications, and construction notes.
The document discusses several electronic circuit designs including a stereo preamplifier with bass boost, an 18W audio amplifier, and an amplified ear circuit to help hearing from far away clearly. The circuits provide details of components, schematics, technical specifications, and construction notes.
Copyright:
Attribution Non-Commercial (BY-NC)
Available Formats
Download as DOC, PDF, TXT or read online from Scribd
The document discusses several electronic circuit designs including a stereo preamplifier with bass boost, an 18W audio amplifier, and an amplified ear circuit to help hearing from far away clearly. The circuits provide details of components, schematics, technical specifications, and construction notes.
Copyright:
Attribution Non-Commercial (BY-NC)
Available Formats
Download as DOC, PDF, TXT or read online from Scribd
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Kumpulan Rangkaian
Elektronika Rangkaian elektronika sederhana
Posts Tagged ‘Amplifier’
Stereo Preamplifier with Bass-boost
Tuesday, December 23rd, 2008
Stereo Preamplifier with
Bass-boost Desain Sederhana yang berkualitas
20 s/d 30 Volt Supply
Gambar Rangkaian Preamplifier
Parts:
P1_________________10K Log.Potentiometer (Dual-gang for stereo)
SW1________________DPST Switch (Optional, see Notes)
Comments:
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed. This circuit features also a bass-boost, in order to overcome this problem. You can use a variable resistor to set the bass-boost from 0 to a maximum of +16dB @ 30Hz. If a fixed, maximum boost value is needed, the variable resistor can be omitted and substituted by a switch. Notes:
* Schematic shows left channel only, but R1, R2, R3 and C1, C2, C3 are common to both channels. * For stereo operation P1, P2 (or SW1), R4, R5, R6, R7, R8 and C4, C5, C6, C7 must be doubled. * Numbers in parentheses show IC1 right channel pin connections. * A log type for P2 ensures a more linear regulation of bass-boost. * Needing a simple boost-in boost-out operation, P2 must be omitted and SW1 added as shown in the diagram. * For stereo operation SW1 must be a DPST type. * Please note that, using SW1, the boost is on when the switch is open, and off when the switch is closed.
• Can be directly connected to CD players, tuners and tape recorders.
• Do not exceed 23 + 23V supply. • Q3 and Q4 must be mounted on heatsink. • D1 must be in thermal contact with Q1. • Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical. • Adjust R3 to read a current between 20 to 30 mA with no input signal. • To facilitate quiescent current setting add R8 (optional). • A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Connect C6 to the output ground. • Then connect separately the input and output grounds to the power supply ground. ________________________________________
Technical data:
Output power: 18 Watt RMS into 8 Ohm (1KHz sine wave) Sensitivity: 150mV input for 18W output Frequency response: 30Hz to 20KHz -1dB Total harmonic distortion @ 1KHz: 0.1W 0.02% 1W 0.01% 5W 0.01% 10W 0.03% Total harmonic distortion @10KHz: 0.1W 0.04% 1W 0.05% 5W 0.06% 10W 0.15% Unconditionally stable on capacitive loads
Tags: Add new tag, Amplifier, hobi elektronika, rangkaian elektronika
Posted in Audio | No Comments »
Alat bantu pendengaran
Tuesday, December 16th, 2008
dengar suara nun jauh dengan jelas
Supply battere 1,5 v
Disitus aslinya Rangkaian ini dinamakan Amplified Ear.Rangkaian ini di hubungkan ke mini- earphones 32 ohm.dapat mendeteksi suara yg sangat jauh.sangat berguna ketika berada di tempat luas yg yang kurang memiliki sistem sound yang bagus seperti ruang pertemuan,ruang rapat,ruang kuliah.setiap kata akan terdengar sangat jelas.kita juga dapat menonton TV dengan volume yg disetel sangat Pelan,agar tidak mengganggu keluarga dan tetangga yg sedang istirahat atau tidur.bahkan jika memiliki pendengaran yg kurang sempurna sekalipun,kamu akan mendengar suara yg tak terbayangkan sebelumnya menggunakan perangkat ini.\
The heart of the circuit is a constant-volume control amplifier. All the signals picked-up by the microphone are amplified at a constant level of about 1 Volt peak to peak. In this manner very low amplitude audio signals are highly amplified and high amplitude ones are limited. This operation is accomplished by Q3, modifying the bias of Q1 (hence its AC gain) by means of R2. A noteworthy feature of this circuit is 1.5V battery operation. Typical current drawing: 7.5mA. Notes:
* Due to the constant-volume control, some users may consider P1 volume control unnecessary. In most cases it can be omitted, connecting C6 to C3. In this case use a SPST slider or toggle switch as SW1. * Please note the stereo output Jack socket (J1) connections: only the two inner connections are used, leaving open the external one. In this way the two earpieces are wired in series, allowing mono operation and optimum load impedance to Q4 (64 Ohm). * Using suitable miniature components, this circuit can be enclosed in a very small box, provided by a clip and hanged on one’s clothes or slipped into a pocket. * Gary Pechon from Canada reported that the Amplified Ear is so sensitive that he can hear a whisper 7 meters across the room. He hooked a small relay coil to the input and was able to locate power lines in his wall. He was also able to hear the neighbor’s stereo perfectly: he could pick up the signals sent to the speaker voice coil through a plaster wall. Gary suggests that this circuit could make also a good electronic stethoscope.
Tags: Amplifier, hobi elektronika, rangkaian elektronika
Posted in Audio | 4 Comments »
2W Audio Amplifier Monday, December 15th, 2008
Amplifier 2W Rangkaian Ampilifier ini di desain untuk bisa di masukan kedalam mini box speaker 2 , 4 dan 8 ohm.rangkaian ini juga dilengkapi dengan switch Bass-Booster.dapat di hubungkan ke jalur output walkman,mini disc,iPod,CD Player ,Komputer dan perangkat lain yang sejenis yang ada jalur output headphonenya.
Rangkain ini di desain tanpa menggunakan IC dengan menggunakan metode yang terkesan agak ketinggalan zaman.ampilfier di supply dengan tegangan 12 v.switch SW1 akan menghasilkan suara bass-booster,tapi pada saat bersamaan volume harus dinaikan sebagai kompensasi kehilangan tenaga pada frekwensi tinggi.
Gambar Mini Ampilfier 2W
Komponen
Resistor
P1_____________10K Log.Potentiometer
R1,R2__________33K 1/4W Resistors
R3_____________33R 1/4W Resistor
R4_____________15K 1/4W Resistor
R5,R6___________1K 1/4W Resistors
R7____________680R 1/4W Resistor
R8____________120R 1/2W Resistor
R9____________100R 1/2W Trimmer Cermet
Kapasitor
C1,C2__________10µF 63V Electrolytic Capacitors
C3____________100µF 25V Electrolytic Capacitor
C4,C7_________470µF 25V Electrolytic Capacitors
C5_____________47pF 63V Ceramic Capacitor
C6____________220nF 63V Polyester Capacitor
C8___________1000µF 25V Electrolytic Capacitor
Dioda D1___________1N4148 75V 150mA Diode
Transistor
Q1____________BC560C 45V 100mA PNP Low noise High gain Transistor
Q2____________BC337 45V 800mA NPN Transistor
Q3____________TIP31A 60V 4A NPN Transistor
Q4 ___________TIP32A 60V 4A PNP Transistor
Lain-lain
SW1___________SPST switch
SPKR__________3-5 Watt Loudspeaker, 8, 4 or 2 Ohm impedance
dalam penggunaan nantinya,R9 harus di set dengan seksama demi mengurangi distorsi suara yang di timbul.dan tentu saja harus di buat 2 buah rangkaian untuk menghasilkan output stereo dari rangkaian ini.
selamat mencoba
Tags: Add new tag, Amplifier, hobi elektronika, rangkaian elektronika
Posted in Audio | 5 Comments »
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