Showing posts with label mini. Show all posts
Showing posts with label mini. Show all posts
Monday, November 3, 2014
Simple Mini Power Inverter
Even robot systems occasionally need a negative supply voltage for some purpose or other, and in this kind of application in particular there is a need for an effective circuit that does not make greater demands then necessary in terms of current or space. If a low current 5 V supply is needed and only +5 V is available, a natural manufacturer to turn to is Maxim, and indeed in this case they do not let us down.The best known integrated circuit made by this company is the MAX232, a level shifter for serial ports with an integrated charge pump that does not need an external inductor.
Simple Mini Power Inverter image:
Along the same lines, although with a more stable output voltage and higher efficiency, is the MAX660. The device can ‘mirror’ any input voltage between 1.5 V and 5.5 V. With a 5 V input the output is typically –4.7 V with a load of 100 mA. Efficiency at 10 mA is around 96 % and at 100 mA is around 88 %. With an open-circuit output the IC draws a quiescent current of just 120 μA.There is little to say about the circuit itself.
Simple Mini Power Inverter Circuit diagram:
The 0 Ω resistor on pin 1 selects the operating frequency. With R1 fitted, the circuit operates at 80 kHz; without it, at 10 kHz. The combination of L1 and C5 slightly reduces ripple on the output voltage; the choice of inductor is not as critical as it would be if it formed part of the switching circuit.Gerber files for the printed circuit board (which uses some SMD components) are available for download from the Elektor website, ref. 070279-11.zip. R1, C1 and C4 are 0603 SMDs and C3 is an SMD tantalum electrolytic capacitor. Either the MAX-660CSA or the MAX660M can be used; both come in SO8 packages. L1 is a 10 μH SMD inductor rated at 300 mA.
Tuesday, October 14, 2014
5″ – 6″ Mini Subwoofer BandPass 4th Order Isobaric circuit
The order of 4 or sealed rear chamber bandpass system is essentially a system of watertight enclosures with the addition of an acoustic filter for the driver. The resulting system usually provides a lower cut-off frequency, the compromise that a larger case. The space can be reduced by two drivers in isobaric configuration.
4th-order bandpass systems generally show better able to handle the functions that the other major systems are considered. The transient response and is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.
Since all output 4th order bandpass system is via the port, the largest diameter possible for the port area should be used to minimize noise from the port. The ports must be incinerated where possible, for the same reasons.
The 4th order bandpass system rarely allows a perfect bandpass response - there is usually an out-of-band noise present in the production. A notch filter can be used simply to reduce the noise as audible. Otherwise, a lowpass filter used in series with the driver, but the in-band response system may be affected if this approach is taken.
As the speaker sound 4th order band pass issued by the openings or ports on the port side of the box, the port noise inevitable.
This unwanted noise can be minimized by a notch filter and the largest diameter possible for the port of the area should definitely be used. Another option is to burn the ports of the 4th order bandpass room as this will certainly help to reduce unwanted extra from the subwoofer.
Mini SubWoofer Power Amplifier clik for detail
WOOFER / MID MODEL - 5MP60 / N
Specifications
Nominal Basket Diameter 5 "/ 125mm
Impedance 8 ohm
RMS Power 50 Watts
Program Power 100 Watts
Frequency response 50Hz - 12.0kHz
Sensitivity (1W/1m) 91dB
Voice Coil Diameter 1 "/ 25.8mm
BL Factor 6.4 N / A
Voice Coil Length 14 mm
Air Gap Height 6mm
X Damage (peak to peak) 20 mm
Magnetic Assembly Weight 2.2 lbs / 1.0 kg.
Edit Information
Diameter 5.28 "/ 134mm x 5.28" / 134mm
Bolt Circle Diameter 5.4 "/ 137mm
Baffle Cutout Diameter --
- Front Mount 4.72 "/ 120mm
Many of the 4 mounting holes
Volume displaced by driver, 019 m 3 / .5 liter
Total Depth 2.68 "/ 68mm
Net weight 2.64 lbs / 1.2 kg.
Weight 2.8 lbs / 1.27 kg.
Materials
Basketball aluminum diecast
Polypropylene cone
Rubber Surround
Voice Coil Wire Copper
Ferrite
Thiele-Small Parameters
Resonance Frequency (FS) 60 Hz
Impedance (Re) 5.33 ohms
Coil Inductance (Le) 0.4 mH
Mechanical Q (Qms) 1.604
Electrical Factor (Qes) .35
Total Q (Qts) .29
Comp. Equivalent Vol. (Vas) 35 FT3 / 9.8 Liter
Voice Coil Overhang (Xmax) 4.0mm
Reference yield 5%
Volume Displacement 34 cm3
4th-order bandpass systems generally show better able to handle the functions that the other major systems are considered. The transient response and is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.
Since all output 4th order bandpass system is via the port, the largest diameter possible for the port area should be used to minimize noise from the port. The ports must be incinerated where possible, for the same reasons.
4th order Ssobaric Subwoofer Box Design
The 4th order bandpass system rarely allows a perfect bandpass response - there is usually an out-of-band noise present in the production. A notch filter can be used simply to reduce the noise as audible. Otherwise, a lowpass filter used in series with the driver, but the in-band response system may be affected if this approach is taken.
As the speaker sound 4th order band pass issued by the openings or ports on the port side of the box, the port noise inevitable.
This unwanted noise can be minimized by a notch filter and the largest diameter possible for the port of the area should definitely be used. Another option is to burn the ports of the 4th order bandpass room as this will certainly help to reduce unwanted extra from the subwoofer.
Mini SubWoofer Power Amplifier clik for detail
WOOFER / MID MODEL - 5MP60 / N
Specifications
Nominal Basket Diameter 5 "/ 125mm
Impedance 8 ohm
RMS Power 50 Watts
Program Power 100 Watts
Frequency response 50Hz - 12.0kHz
Sensitivity (1W/1m) 91dB
Voice Coil Diameter 1 "/ 25.8mm
BL Factor 6.4 N / A
Voice Coil Length 14 mm
Air Gap Height 6mm
X Damage (peak to peak) 20 mm
Magnetic Assembly Weight 2.2 lbs / 1.0 kg.
Edit Information
Diameter 5.28 "/ 134mm x 5.28" / 134mm
Bolt Circle Diameter 5.4 "/ 137mm
Baffle Cutout Diameter --
- Front Mount 4.72 "/ 120mm
Many of the 4 mounting holes
Volume displaced by driver, 019 m 3 / .5 liter
Total Depth 2.68 "/ 68mm
Net weight 2.64 lbs / 1.2 kg.
Weight 2.8 lbs / 1.27 kg.
Materials
Basketball aluminum diecast
Polypropylene cone
Rubber Surround
Voice Coil Wire Copper
Ferrite
Thiele-Small Parameters
Resonance Frequency (FS) 60 Hz
Impedance (Re) 5.33 ohms
Coil Inductance (Le) 0.4 mH
Mechanical Q (Qms) 1.604
Electrical Factor (Qes) .35
Total Q (Qts) .29
Comp. Equivalent Vol. (Vas) 35 FT3 / 9.8 Liter
Voice Coil Overhang (Xmax) 4.0mm
Reference yield 5%
Volume Displacement 34 cm3
Saturday, August 23, 2014
Mini Amplifier with 3 Transistor
Mini 3 transistor amplifier is a simple amplifier with 50mW power drawn by 3 transitor.
The series of three mini-amplifier transistors can be used for loud speaker 8 ohm load. Source voltage required to activate the mini-amplifier can be drawn from the batteries 9V.Rangkaian 3 transistor amplifier is often used in simple portabe audio devices such as radios or small tape recorder. Mini-transistor amplifier circuit 3 is quite simple as shown in the figure below.
![Mini]()
Mini-transistor amplifier circuit 3 includes type of amplifier OTL (Output Transformer Less). Mini-transistor amplifier circuit 3 is used for output coupling capacitors. Amplifier circuit is simple and suitable when used for audio amplifier experiment.
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The series of three mini-amplifier transistors can be used for loud speaker 8 ohm load. Source voltage required to activate the mini-amplifier can be drawn from the batteries 9V.Rangkaian 3 transistor amplifier is often used in simple portabe audio devices such as radios or small tape recorder. Mini-transistor amplifier circuit 3 is quite simple as shown in the figure below.
Mini-transistor amplifier circuit 3 includes type of amplifier OTL (Output Transformer Less). Mini-transistor amplifier circuit 3 is used for output coupling capacitors. Amplifier circuit is simple and suitable when used for audio amplifier experiment.
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