AmplifierCircuits

Amplifier description:      This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman, Mini-Disc, iPod and CD players, computers and similar devices fitted with line or headphone output. Of course, in most cases you will have to make two boxes to obtain stereo. The circuit was deliberately designed using no ICs and in a rather old-fashioned manner in order to obtain good harmonic distortion behavior and to avoid hard to find components. The amplifier(s) can be conveniently supplied by a 12V wall plug-in adapter.Closing SW1 a bass-boost is provided but, at the same time, volume control must be increased to compensate for power loss at higher frequencies. In use, R9 should be carefully adjusted to provide minimal audible signal cross-over distortion consistent with minimal measured quiescent current consumption; a good compromise is to set the quiescent current at about 10-15 mA. To measure this current, wire a DC current met...

Guitar Circuit description:      This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and output jacks can be encased in a small box having the dimensions of a packet of cigarettes, or it could be fitted also into a real packet of cigarettes like some ready-made units available on the market. This design can be used in three different ways: Loudspeaker amplifier: when powered by a 9V alkaline battery it can deliver about 1.5W peak output power to the incorporated loudspeaker.  Headphone amplifier or low power loudspeaker amplifier: when powered by a 3V battery (2x1.5V cells) it can drive any headphone set type at a satisfactory output power level or deliver to the incorporated loudspeaker about 60mW of output power. This configuration is useful for saving battery costs....

Description Crowbar circuits are so-called because their operation is the equivalent of dropping a crowbar (large steel digging implement) across the terminals. It is only ever used as a last resort, and can only be used where the attached circuit is properly fused or incorporates other protective measures. A crowbar circuit is potentially destructive - if the circuitry only has a minor fault, it will be a major fault by the time a crowbar has done its job. It is not uncommon for the crowbar circuit to be destroyed as well - the purpose is to protect the device(s) attached to the circuit - in this case, a loudspeaker. There's really nothing to it. A resistor / capacitor circuit isolates the trigger circuit from normal AC signals. Should there be enough DC to activate the DIAC trigger, the cap is discharged into the gate of the TRIAC, which instantly turns on ... hard. A TRIAC has two basic states, on and off. The in-between state exists, but is so fast that it can...

Guitar Amplifier description: Guitar Amplifier parts list: R1______________18K 1/4W Resistor R2_______________3K9 1/4W Resistor R3,R6____________1K 1/4W Resistors R4_______________2K2 1/4W Resistor R5______________15K 1/4W Resistor R7______________22K 1/4W Resistor R8_____________330R 1/4W Resistor R9,R10__________10R 1/4W Resistors R11,R12_________47R 1/4W Resistors R13_____________10R 1W Resistor C1_______________1µF 63V Polyester Capacitor C2_____________470pF 63V Polystyrene or Ceramic Capacitor C3______________47µF 25V Electrolytic Capacitor C4______________15pF 63V Polystyrene or Ceramic Capacitor C5_____________220nF 100V Polyester Capacitor C6_____________100nF 63V Polyester Capacitor  D1,D2,D3,D4___1N4148 75V 150mA Diodes  Q1,Q2________BC560C 45V 100mA Low noise High gain PNP Transistors Q3,Q4________BC556 65V 100mA PNP Transistors Q5___________BC546 65V 100mA NPN Transistor Q6___________BD139 ...

General description: Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. Q6 & Q7 must have a small U-shaped heatsink. Q8 & Q9 must be mounted on heatsink. Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter in series with Q8 Drain) with no input signal. A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 at output ground. Then connect separately the input and output grounds at power supply ground. Amplifier circuit diagram: Part list: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R7 = 33K 1/4W Resistors R8 = 150K 1/4W Resistors R9 = 15K 1/4W Resistors R10 = 27R 1/4W Resistors R11 = 500R  1/2W Trimmer Cermet R12,R13,R16 = 10R 1/4W Re...

General description      The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies. In the low frequencies is degraded the sense of direction. This reason us leads to the utilization speaker for the attribution of very low frequencies. The manufacture that to you we propose distinguishes these frequencies, in order to him we lead to the corresponding amplifier. The acoustic filters are met in various points in the sound systems. The knownest application they are the filters baxandal for regulating tone low and high frequencies and filters crossover where the acoustic region is separated in subareas, in order to it leads the corresponding loudspeakers. The application that to you we propose is a simple filter of region that limits the acoustic region (20-20000Hz) in the region 20-100Hz.      With the manufacture that to you we propose you can make a active filter in order to you lead a loudspeak...

Variations in the anatomy of a subwoofer dramatically changes their performance characteristics. An increase in voicecoil size coupled with a stronger cone material yields a higher power handling and increased output. By combining quality materials with Rockford’s proprietary acoustic technologies, our subwoofer lineup is sure to meet your system’s demands. Basket - Also referred to as the frame or chassis, this is the skeletal system of the speaker. Here to keep everything in its place. Spider - Second part of the speakers suspension, connects the cone and voice coil to the basket and controls the travel of the cone assembly. Voice Coil - The brains of the operation, directing the force from the magnet to push or pull based on the applied electrical signal. Surround - First part in the speakers suspension, attached to the cone to maintain the centering of the voice coil in the magnetic gap. Cone - A.K.A the diaphragm, this is the voice of the spea...