Showing posts with label portable. Show all posts
Showing posts with label portable. Show all posts
Wednesday, July 31, 2013
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Wednesday, March 20, 2013
Mini Portable Guitar Amplifier
Can be fitted into a packet of cigarettes Also suitable as Fuzz-box
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.
Circuit diagram:
Mini Portable Guitar Amplifier Circuit Diagram
| Parts | Description |
| R1 | 22K 1/4W Resistor |
| C1 | 10µF 25V Electrolytic Capacitor |
| C2 | 100nF 63V Polyester or Ceramic Capacitor |
| C3 | 220µF 25V Electrolytic Capacito |
| IC1 | TDA7052 Audio power amplifier IC |
| J1,J2 | 6.3mm Stereo Jack sockets (switched) |
| SPKR | 8 Ohm Loudspeaker (See Notes) |
| B1 | 9V PP3 Battery or 3V Battery (2 x 1.5V AA, AAA Cells in series etc.) |
| Clip for PP3 Battery or socket for 2 x 1.5V AA or AAA Cells |
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.
- Fuzz-box: when powered by a 3V battery (2x1.5V cells) and having its output connected to a guitar amplifier input the circuit will behave as a good Fuzz-box, showing an output square wave with marked rounded corners, typical of valve-circuits output when driven into saturation.
Notes:
- For the sake of simplicity and compactness, this unit employs a dual bridge IC amplifier and a few other parts. For the same reason no volume or tone controls are provided as it is supposed that the controls already existing on the electric guitar will serve satisfactorily to the purpose.
- No power switch is used: the battery voltage will be applied to the circuit when the input plug will be inserted in the input jack socket J1. For this purpose be sure that the input plug is a common 1/4 inch guitar mono jack plug and J1 is a 1/4 inch stereo jack socket.
- The output jack socket J2 must be a switched stereo type. The changeover switching is arranged in such a way that, when a common headphones stereo jack plug is inserted into the socket, the loudspeaker will be disabled and the mono output signal will drive both the headsets in series, allowing full headphone reproduction. When used as a Fuzz-box output, a mono jack plug must be inserted into J2.
- If the amplifier is intended to be encased in a packet of cigarettes, standard loudspeaker diameter should be 57 or 50mm.
Source:www.redcircuits.com
Sunday, March 17, 2013
Portable Phone Preamplifier
This unit was designed for fans to have an old vinyl record collection and willing to be digitally remastered on a personal computer. Or sometimes you can hear an old collection of priceless LP, through its modern hi-fi, usually without a preamp stage: this is a circuit capable of meeting their needs. The unit is powered by a 9V battery, allowing for quick and easy connection to all the pre-amp high level input and drawing very low current circuit ensures long battery life.
Despite the low voltage circuit performance with moving magnet pick-up is quite good, with high input overload capability, very low distortion and accurate reproduction of the RIAA equalization curve, thanks to one of two stages of the operational amplifier circuit in which the RIAA equalization network is divided into two halves: an input stage of the application of low-strengthening the RIAA equalization curve in a cable series feedback configuration and a second stage, the application of the acute curve cutting through a second operational amplifier connected to the shunt feedback configuration.
Battery operation is also minimized the possibility of hum pick-up, a potential danger is always present in a high gain, high sensitivity phono preamps. As the drawing of the total circuit current is 1. 2 mA when powered by a 9V battery, the use of an LED lamp will be the main cause of current consumption. Therefore, a very small, low current red LED recommended for this purpose. With a resistance of 6.8K limit specified for R11, the LED will draw an additional current of 1 mA, it will not shine, but can still be easily seen.
A typical carbon-zinc 9V battery will allow the circuit to operate about 180 hours, while an alkaline battery will last over 250 hours. If the LED is omitted, the duration is almost double. In any case, for those who wish to preserve the battery, the circuit can also be powered by a common external adapter power supply, valued at about 12-15V DC, 10 mA or higher. In this case, the input circuit overload will increase even more.
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