STP-CM99-101

USB POWERED CONDENSER MICROPHONE

SOLD  For 25$

Its a Condenser Microphone. Which takes power from USB port of computer and requires no battery. There is a toggle switch to turn it on and off. Audio output is taken from 1/8 inch female jack through a stereo cable to line in of computer. Or 1/8inch to 1/4 inch jack cable is used to connect it with pro audio interface.

Omnidirectional Condenser Microphone. High Quality Recording Microphone.
Typical Frequency Response Curve. 2.2kΩ Impedance
Suitable For:

• Broadcast
• Musical Instruments
• Voice Recognitions
• Wildlife Recordings

 Parts:

• Toggle On/Off Switch.
• LED Indicator.
• Output Stereo Female Jack 1/8 Inch.
• Very Light Weight.
• Portable.

Very low noise performance.
Package Contains:

• Microphone
• 1/8inch to 1/8inch Stereo Audio Cable

 SOUND SAMPLE:

Here is how it record Acoustic Guitar

Its action on Vocals:

DETAILS: 

• Designed for high resistance to vibrations, high signal-to-noise ratio.
• High sensitivity type.

Capsule used in this microphone is our project. Its model was given as "STP-611-BECMC-01"

It is very sensitive capsule that can caught the sound of surrounding too.

Frequency Response Curve:

Sensitivity is about –35±4dB (0db = 1V/pa, 1kHz)
Impedance Less than 2.2 k
Directions Omnidirectional
Frequency 20–20,000 Hz
Max. operation voltage 10V - 12V
Standard operation voltage 4.5V
Current consumption Max. 800mA
Sensitivity reduction Within –3 dB at 1.5V
S/N ratio More than 62 dB

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CLICK TO VIEW ITS CIRCUIT DIAGRAM & MORE DETAILS

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Project of "Sam Technology Professionals"
Project Code : STP-CM99-101
Warranty       : No
Parts             : Repairable
Lifetime         : 10 Years
Color             : White

STP-1119-AR-206

6 Ohm-50W Guitar Amplifier

This is a 50W Guitar Amplifier. (Guitar Practice Amp)
Original Pictures Attached. Loud and Clean Sound.
Contains One 50W-6Ohm Speaker (5.5inch)
It works 100% fine.
It is suitable for Electric Guitars and Semi-Acoustic Guitar.

 One 100K Ohm Potentiometer Use to control the gain of input from any guitar or signal generating devices. It works with electric guitars. You can use guitar effect pedals with it. It has clear and loud sound. It has a 5.5inches large speaker.

It has one input and one output. Purpose of output is to attach external speakers.

Circuit contains a 12v -2Ah transformer and a rectifier capacitors and resistors filter to attain clean output. Speaker's output is balanced by putting resistor and a capacitor from out +ve to GND.

 One toggle on/off switch connected after the transformer. One red LED indicates the power on/off.

 Works very well with effect pedals using buffers if required. Specially suitable for Semi-Acoustic and Electric Guitars.

 Light weighted wooden Box as shown in the pictures.
Circuit is designed by "Illusion Semi Conductors Team" (Winners of Designing Circuit From STP)

Circuit is based on an expensive high performance IC LA4440a.

 FINAL PRICE : 2000/- Rs. pkr (Negotiable)

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Project of "Sam Technology Professionals"
Project Code : STP-1119-AR-206
Warranty        : Limited Parts

 In the newer version STP-1119-AR-207 we'll be adding bass treble and Volume knobs to control tone.

STP-21190375-DL

Its a High Intensity LED bulb based light which is a chip LED. And it is a replacement of an Energy Saver Tube Bulb of Power 15 Watt.
The circuit is very simple designed by STP in 2014.
It works with AC directly by plugging the switch into socket.
Its a bit risky because of its metal box outlook. But the insulation of wire inside is 100% safe.

Contains:

4 - Diodes 1N4007

1 - Capacitor 4.7uf (25V) Electrolytic.

1 - Heat Sink Metal for mounting the LED Flash Light Chip

1 - Transformer AC/DC 12v 800mA

Transformer:

AC Input         = 220-250v

AC Frequency = 50-60Hz

Input Current   = 0.1A             = 100 mA

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DC Output Potential Difference    = 12V

Current Output                             = 0.8A  = 800mA

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Power:

P                      =V*I

P                     =12*0.8 =9.6 Watt

Total Power is = 9 Watt.

Precaution Mentioned on device:

• Do not touch while switch is plugged. Firstly mount it on wall or place it out of the reach of children. Then plug it into socket and turn the switch on.
• Do not operate it even if you're a professional. Because Sam Technology Professionals device designing is very hard to understand for other people. So to avoid risk contact us.

It was tested for a long time and reported to work. Longer than a tube bulb of 15 Watt. So this was actually the best method to save energy. The light is good for using it as a study lamp or lab work etc.

STP-0792588-PA-17

Created in 2013 

This is a Dynamic Mic Preamplifier for recording broadcast. Output signals doesn't has a DC offset whatever the type of your mic is.
A song was recorded for fun and it was amazing.

It was fit in a metal project box. And this was an amazing experience for us to fix such sensitive thing in metal box by attaching the ground of circuit with the box screws. And due to that we had very low noise performance. And the gain was high enough to record a broadcast.
The circuit was designed by Illusion Semi Conductors Team contains single 2SC9013 a common NPN transistor.
It works with 9v battery and it requires no filter because of the circuit design. 
The DIY video was aired on YouTube.

Click to view its schematic and complete details 

 This preamp used for few days and it was in our project library. Later a buyer came and bought it.
It was sold at 25th of Feb 2014. 
Its circuit is open for the buyer for easily detecting the if occurs.
We created several and only two more are left.

STP-1119-AR-205

Created in 2013
It was a wonderful project. It was a small guitar practice amp gives several types of electric guitar sounds.
Works with acoustic as well. Based on Two LM386.
Has a proper filtering system and a VR to control the gain/volume. It has a built in speaker of 4Ohm 5 Watt.
It has a loud sound. It also gives distortion guitar sound.
It works direct with the power supply inserted through a female DC jack.
Click to view its DIY Tutorial.
Click to view its Project Details with schematic. 

It was sold at 24th of Feb 2014. The buyer was happy with its working. And for that buyer it has a lifetime warranty. Three more guitar amplifiers are left now.

STP-211-PA-0751 (LXY-STP)

Created in 2011
It is a JFET based high impedance microphone's and guitars pre-amplifier. It has one LED and a toggle switch.
One Output.
Three input 1/4 audio jack etc.
It has a simple RC filter circuit built in for the low noise performance. The RC filter is STP-RCF-446-LX.
It was created for a semi-acoustic guitar and it was tested and reported to work 100% OK.

(All of three pieces were sold.)

It was sold at 24th of Feb 2014. It has no warrant.

Click to view schematic and details.

Click to view Tutorial

STP-0977PA

Created in 2012
It was a preamplifier applicable at 30v. It was a low noise and balanced pre-amp for the microphones.
It has a 50K pot to set the gain of input.
It was based on BC109 and BC547,C9013 etc  common NPN and PNP transistors.

It was about to modify to take it to 12v but the project kept in store and wasn't modified. It is still waiting for attention.