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Preamp board for dynamic microphone


1. 1×10kΩ resistor 1/4w.
2. 1×100kΩ resistor 1/4w.
3. 1×1kΩ resistor 1/4w.
4. 1×680Ω resistor 1/4w.
5. 2×104pF capacitor 100V.
6. 1×1uF capacitor 50/63V.
7. 1×2.2uF capacitor 50/63V.
8. 2×1000uF capacitor 25V.
9. 4×1N4007 diode.
10. 1×2 pin connecter base 2.54 mm.
11. 1×3 pin connecter base 2.54 mm.
12. 1×2 pin screw connector.
13. 1×7815/7812 + voltage regulator ic.
15. 1×7915/7912 - voltage regulator ic.
15. 1×47k single turn potentiometer.
16. 1×3 mm Led.
17. 1×741 ic

License©Technical Mriganka. You can't use this pcb layout for commercial purpose. You can use this pcb layout only for educational and diy projects.

In this post I make a preamplifier for dynamic microphone using 741 ic. you can also use here TL071 or TL081 ic. Frequency response 20hz - 20khz. For power supply you can use 12-0-12V 500mA/750mA transformer.

How to make pcb by ironing mathod► 
For make pcb you need pcb layout. download the pcb layout and print it by laser printer on photo paper. Then cut the pcb layout. Then press the pcb layout by iron on copper clad board. Press the iron 10-15 munites. Then leave the pcb for cool down 10 munites. when the pcb was cool, put the pcb in water and move the pcb layout to copper clad board. Then put the pcb in ferric chloride [FeCl3+H2O] for etching 10-15 munites. when etching was end, clean the pcb by water. Then make hole on pcb. And then press the upper side print of pcb. Now your pcb is ready, mount components by instruction.

How to test this tone control► 
After complete this board don't forget to series light test.
After connecting the series light, make sure that the series light does not turn on. If the series light not turn on, then check the voltages.
output voltage = 0.0 volt
Mic input voltage = 0.0 volt
if you get same voltages, then connect this preamp to amplifier.

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