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Tuesday, 28 October 2014



This is our new microphone for high quality audio. It contains 34mm large diaphragm pressure gradient transducer.
We designed its circuit for using it without phantom power. The kit regulates voltage from 5v to 48v like the interfaces do. We have encapsulated the circuit of USB phantom power into it. This 48v phantom power is then given to the capsule. And then output is taken from C1 linked with hot wire of capsule and given to the additional built in preamp based on TL071 low noise OP-Amp.

We used a thick mesh as you can see in the pics. 
Now here is a question.! How i design the body in this mic shape? Well i'll make another post on how i did the whole thing.

Microphone works with an unbalanced power cord cable that is XLR to 3.5mm stereo jack that goes to the microphone port of computer soundcard

On the top of this microphone there is another mesh which is bended as you can see in the picture. You can see some screws that are holding the mesh in the microphone. But the mesh on the top of this microphone is joined with super glue.

There is another screw in the mid of the body which looks useless but infact that is preventing the huge noise. It is joined with the GND of the circuit.

I painted it black with black spray color bottle. Because that is the easiest way to get the high quality color with shining.

You can see that the shock mount is attached with it and fixed tight with the grip ring.
Overall the method i used to make this is really difficult. Once it is done you cannot open it. You cannot repair it. This is just disposable. But believe me the parts are assembled in such a way that damage cannot be done.

Here are some specification of this microphone:

Unit : Super-Cardioid Pressure Gradient Transducer
Directivity : Omni-directional
Frequency Response : 20Hz-16kHz
Sensitivity : -38dB (0dB=1V/Pa at 1kHz)
Output Impedance : 150 Ohm 30% Polarity (at 1kHz)
Load Impedance : >1000 Ohm
Equivalent Noise Level : 16dBA
Max. Sound Pressure Level : 132dB (at 1kHz < 1% T.H.D)

S/N Ratio : 78dB
Current Consumption : 3mA

Project of : Sam Technology Professionals
Project Code :  STP-VM9-D3
Warranty   : N/A


PPB stands for Phantom Power Box. It is used to boost the signals. You plug this microphone in it and takes output to the line in of your PC or you can drive another amplifier. You can use it with interfaces to attain the high quality sound.
PPB  can be powered by a single 9v battery or you can power it with the USB cable. PPB is our new technology to use microphone in a different and clean way.
(I'll post about it in the next week).

"Need to add some samples, I need silence while recording. So it will be easy to judge the quality. I shall post the demo audio soon."

Monday, 22 September 2014



We tried to Make AP1 cheap so every one could buy and enjoy the high quality of sound.
We used TSB165A Capsule and used PCM 2902 IC for USB Interface. 
Like AP1 it also have some buttons option like Volume Up, Volume Down, Mic Mute, Headphone Mute etc.
But we didn't connect these buttons with our kit because of low space in the metal body of microphone. Yes we took the body of an ideal Vintage Condenser Handled Microphone as you can see in the pics below:

Here you can see it was a Vintage Microphone which was useless for us.
So instead of sending it to recycle we used it to give our buyers the pleasures of high quality audio.

This microphone doesn't have a Line In option but it has Headphone Option.
Yes you can connect your headphone into this microphone.

We tried to make  USB Microphone before but that had DC offset problem. In this microphone that problem has been resolved.

It has no latency rate problem because it has its own jack for headphone. You can control through your computer audio mixer that either you want audio from your headphone or not.
You can play MIDI Through it because it has a MIDI Sw Synth Option into its software like our computer sound card have.

Warranty             : N/A because of its packing. It is packed with the Super Glue and it is really hard to open it. It wouldn't open but it will break. 
This packing was suggested by our Chairman "ASIM ALI"  for hackers who want to copy and build our circuit.
This page named as project codes shows the projects we sell. Its a little business we are growing. When we want to provide you circuit we post their links here but there are many things and their modification what we don't post because some persons had hacked our circuits before. But still we are with you. If you contact us by phone call and ask us about circuits we can give you after verifying you (This offer is not available for some countries).

:) Regards:
Engg Sania (Moderator) 


USB Condenser Microphone

AP1 was real expensive due to its design and its functions here is a picture of it:

This microphone is professional Studio Microphone with some extra function. 
It has two 3.5mm female input ports for connecting other things. These ports were named as :
This Microphone has Four Buttons on it which are also 3.5mm in size. These are push buttons and they were named as:
  • Volume Up
  • Volume Down
  • Headphone Mute
  • Line In Mute

This microphone has a cable to connect it with USB that cable is:
5 pin XLR to USB Connector Cable

This microphone was one of the best microphone we have ever made.

Price of this microphone was 120$ USD.
We made only one and sold it.

This Microphone was based on a capsule that is TSB2555A Professional Large Diaphragm.


Condenser Microphone Based on "TSB-160a Capsule".
Ad and pics of this microphone were posted here on this link:


Condenser microphone suitable for vocals, guitar and broadcasts etc. Connect with your pc or laptop. No external soundcard or hardware is required. Plug and play system.
It has a built in low noise balanced preamp and capsule TSB160A high quality condenser mic element.
Best for recording covers and songs.


Impedance              : 3.3k ohm
J-FET Used            : MPF102
Operating voltage    : USB source 5v
Output To               : Stereo 3.5mm jack
Frequency response: 8000Hz to 19000Hz


It is clear that in cheap international price you get the high quality vocal microphone that do not need any other hardware like interfaces etc. USB powers up the capsule and gives you output to the line in. If your laptop doesn't have a line in option you can use some USB Interface to pass it through. Or you can also connect this to the microphone port of your soundcard. (In this case you need to reduce your mic port's sensitivity in other words you need to uncheck the option of Mic Boost)
Project of : Sam Technology Professionals
Project code: STP-CM99-105
Warranty : N/A

Saturday, 19 July 2014


Professional Dynamic Microphone

This is a Professional Dynamic Microphone. There is no comparison of this microphone. You can compare it with any professional and expensive microphone and it will be the only winner. We have built its capsule that provides quick response diaphragm joint to the coil having an impedance about 150-160 Ohm. It has a good magnet built into it. 
This microphone has a very light weight. It looks very stylish and beautiful. Its body is made of pure plastic that is strong enough can't be broken easily.
Go and Build your own studio, manage live performances and big shows with the help of this cheap offer (Check out this amazing offer below)


Its a best choice for:

  • Vocals
  • Live performances
  • Recording Through Guitar Amplifiers / Sound Modules
  • Recording from Tapes Cassette Players

    It was tested in our lab for one month and finally we got the results. Its frequency response,sensitivity, frequency response curve looks amazing.
    Frequency Response :  16Hz - 20kHz
    Impedance                  :   150-160 Ohm
    Switch On/Off              : Resistance Break Switch

    How this microphone looks like....???

    Here are some pictures captured from iPhone to show you how it looks like.

    We are offering this Microphone in stock. You can buy at least one bundle. One bundle contains ten STP-DM-A12 Microphones with cables and converter jacks. Look them here below.

These cables and converter jacks (1/4inch to 1/8inch stereo) are made of high quality material.

BUNDLE Contains:

  • Ten STP-DM-A12 Dynamic Microphones
  • Ten 1/4inch to 1/8inch Low Noise Converter Jack
  • Ten 1/4inch to XLR 3 pin Low Noise Microphone Cables
  • One XLR to USB Interface for Dynamic Microphones. (Check its specification here)

Price of One Bundle:

Price of one bundle is 250$ USD + World wide shipping cost 0.50$ USD.



We ship worldwide and takes very low charges 5$ USD. You can buy our projects from eBay, OLX.com.pk, Bolee.com.pk etc.
Free Delivery To Pakistan. 

We also deliver all over Pakistan and takes no charges. For purchasing in Pakistan we give a special discount offer that is 15000Rs per bundle. 
(To Purchase within Pakistan Contact Us by Phone Call).

Project Details:

Project Code : STP-DM-A12
Warranty: Optional Parts Warranty
Price : 255$ USD (Inc Shipping) Charges
Sam Technology Professionals - We are promoting the World.

Saturday, 12 July 2014



Its a perfect condenser microphone. Typical frequency response and samples are similar to STP-CM99-101 but its working is little bit different.
It requires no battery no USB plug to power it. It can be powered by Audio interface.
You can plug directly to your computer or laptop.


Omnidirectional Condenser Microphone. High Quality Recording Microphone. Typical Frequency Response Curve. 2.2kΩ Impedance  
Suitable For: 
  • Broadcast
  • Vocals
  • Musical Instruments
  • Voice Recognitions
  • Wildlife Recordings

  • Toggle On/Off Switch.
  • Atmosphere Changing Switch
  • USB Jack Output
Very low noise performance. 

We can say its a Large Diaphragm Capsuled Condenser Microphone.
Weight is very light and its portable. It requires no other hardware.
Project of       : Sam Technology Professionals
Project Code : STP-CM99-102
Status             :  Available
Price               : 2500 Rs - PKR   



It is a fantastic USB Condenser Microphone. It works awesome with every Windows and MAC. You just plug its cable to your PC or Laptop and your PC or Laptop will detect it. It has its own driver so you just sit relax and it do all itself.
Frequency Response is similar to the STP-CM99-101
Omnidirectional Condenser Microphone. High Quality Recording Microphone. Typical Frequency Response Curve. 2.2kΩ Impedance  
Suitable For:
  • Broadcast
  • Vocals
  • Musical Instruments
  • Voice Recognitions
  • Wildlife Recordings

  • Output Stereo Female Jack 1/8 Inch.
Very low noise performance.

Its uniqueness is its USB interface that is built in it. The USB interface is based on an IC PCM29XZ that supports High Definition Audio.
About its Capsule we can say its a Large Diaphragm Capsuled Condenser Microphone.
Weight is very light and its portable. It requires no other hardware.
Project of       : Sam Technology Professionals
Project Code : STP-CM99-102
Status             :  Available
Price              :  3000 Rs - PKR

Friday, 27 June 2014



Its a wonderful microphone for song recording. It is based on TL071 and some very low noise transistor BJT BC109. And its a noiseless microphone. Very good for recording songs and musical instruments like acoustic guitars and drums etc. Also it has a live mode where it will be acting as a dynamic microphone for live concerts or performances.
 This looks like a Dynamic Microphone but it doesn't contain Dynamic Microphone Element. Infact it has an elecktrek condenser microphone that is WM61a made by Panasonic. 

The circuit inside this microphone is balanced and regulates 48v Phantom Power from USB and provide it to the circuit. The capsule required 12v to get fully sensitive. And then the preamp stages amplify and boost their signals.
There is an on/off switch because without it it was going to be bad.
It comes in a box in which a connecting cable is free with it.
It works with Microphone Port or PC Sound Card but for the Low noise performance you can use it through your Line In or you can plug it into your professional audio interfaces.

Project of       : Sam Technology Professionals
Project Code : STP-DM-V02
Lifetime         : 15 Years
Warranty       : 1 Years Kit Warranty (Expired if Damaged or Opened)
Status            : 10 Sold / 17 Available  

Wednesday, 4 June 2014


 Vocal Microphone (USB Powered)

This is an awesome vocal microphone we build it few minutes before. It is a similar version of STP-CM99-101 which was a perfect Condenser Microphone but wasn't so much suitable for Heavy and professional vocal performances. This works very similar to that one but with the presence of a high quality and expensive Dynamic Microphone Element. Its performance is very cool. It is very sensitive to the vocals and other sounds.

Some changes was done to its Element. That was the alteration of the Diaphragm of the Dynamic Microphone element which is just a speaker of  headphones. We replaced this diaphragm with a very thin layered plastic transparent  sheet Diaphragm. And so the frequency response become equivalent to the professional condenser microphones.

We purchased some cheap Dynamic Microphone Case to fit our circuit board, switch, LED and capsules in it. This was done successfully.
After that few samples were recorded and it sounded awesome.

This is the capsule direction.  
 Here you can see the on/off switch that looks cool.
 Here you can see the white crystal LED which lights up when the microphone is turned on.
 Here on the bottom side of this microphone we used a round rubber pieces. And fix the wires because if they move several times they may get damage from inside. So it was done for its safety and Long life.
 Very High Quality USB Cables to provide power was used in this microphone. And an expensive low noise Audio Cable was used to  connect the stereo output jack into this wire.

It works wonderful and in fact awesome with Audio Interfaces.
Here you can take a look of its USB Cable
Here you can see the stereo audio output cable that is connected to the 1/8inch stereo Audio male jack.


When i am 5 feet away from the microphone. UPS Working CPU working these sounds can also be heard in these samples.

And here is another sample when i am 5 inches away from this microphone.


We are here with more sound samples and we are here comparing Normal Computer Headphone Microphone which consists of an Element which is an Electrek Capsule WM61a and Our project that contains Expensive Thin Diaphragm Dynamic Mic Capsule.
So Here we have Vocal Actions 
Vocals were recorded on normal microphone ECM Wm61a

Same Vocals on Our STP-DM-01V Microphone were recorded: 

And Here we have paragraph reading recording:
A paragraph recorded on Normal Computer Microphone ECM Wm61a


Same Paragraph was recorded with this STP-DM-V01 Microphone:

After this comparison it is very clear that our "STP-DM-V01" is currently a winner microphone.
After listening to these samples any one can make a final decision about which type of microphone is required for what purpose.

Here we have its frequency response curves

Project Details:

Project By : Sam Technology Professionals
Project Code : STP-DM-V01
Body Type :  Plastic Body
Lifetime     : 15 years
Warranty   :  1 Year   (Expired if damaged or opened)


  • Vocal Recording .
  • Wildlife Recording.
  • Air Sound Recording.
  • Broadcast Recording (Tutorials etc).
  • Musical Instruments Recordings.
  • Voice Recognition Software.
  • Audio Dubbing along Video etc.
 Ad was posted to OLX today for selling it for 3500/- Rs Here you can see - CLICK HERE
STATUS : 49 SOLD / 91 Available

Wednesday, 21 May 2014



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
  • 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


Here is how it record Acoustic Guitar

Its action on Vocals:

  • 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


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