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Summary of Contents for VAMISOUND Schoeps electret
- Page 1 Schoeps electret BUILDING INSTRUCTIONS...
- Page 2 SCHOEPS ELECTRET BUILDING INSTRUCTIONS Dear friend, first of all thank you for your support and choice of the VAMISOUND product. We wish you a happy DIY and the joy of a new microphone in your arsenal!! Jan and Milan...
- Page 3 Before you start building your new microphone please carefully read this building instructions. Attention: Schoeps electret is a quite easy project. The circuit is made up of only a few components. However, it should be borne in mind that certain manual skills will be required or the successful completion of the mic construction.
- Page 4 The Schoeps electret board allows you to build a microphone that is based on the circuitry from the legendary Schoeps small diaphragm microphone. However, thanks to a small modification of the circuit, it can use a electret capsule. The circuit is frequency flat, with no internal equalizer.
- Page 5 Continue by soldering resistors as in the picture. R2 and R3 form a matched pair, the same for R4 and R5. Install the teflon pin and the remaining R1 that feeds into it as if in air.
- Page 6 Continue by installing the FET transistor. I chose the original BC264, whose GATE leg is on its edge. If you choose another FET, keep in mind that the GATE leg may be elsewhere. Always check this against the data sheet of the particular FET transistor.
- Page 7 Now solder the two film capacitors. Note that the C1 position remains unoccupied. C1 forms the LPF for very bright capsules. You can experiment with values of round 22nF if needed. Continue with the installation of two transistors T2 and T3. Before that, match the HFE parameter on these transistors.
- Page 8 Two electrolytic capacitors remain to be installed. Clean the back of the board thoroughly with a brush and isopropyl alcohol to keep it perfectly clean and free of soldering debris.
- Page 9 Now comes probably the most challenging stage of the build and that is installing the RF filter on the XLR connector insert. Take two 2.2nF ceramic capacitors. Solder the first one between pin 1 of the XLR connector insert and pin 2, and the second one between pin 1 and pin 3 of the XLR connector insert. Then output two 47uH inductors from pin 2 and pin 3 of the XLR connector insert as seen in the photo.
- Page 11 What must be added is that the microphone can function even without this filter. So there is nothing stopping you from trying the microphone without it. In this case, just connect pin 1 of the XLR connector to the GND pad on the board, pin 2 to the XLR 2 pad on the board and pin 3 to the XLR 3 pad on the board using a cable.
- Page 12 Put the head basket on the microphone and you can proceed to the first test of the microphone. Connect the microphone via cable to the preamp and activate phantom power. As for the P1 trimmer, set it so that you measure about 4.5V on the drain leg of the FET transistor and 6.1V and the D5/R2 point.
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Page 13: Additional Info
WIRRING INFO 1) Electret capsule wiring: Center terminal cable to teflon pin marked as FD from the bottom side of pcb. Cable from capsule backplate to BCKP pad on the mic pcb. 2) Its always great idea to check phase of DIY microphone against commercial microphone. ADDITIONAL INFO Take you time when soldering the XLR insert. -
Page 14: Bill Of Material
BILL OF MATERIAL Part Value Tol. Min.V Dimmensions link 1 link 2 notes olt. Resistors 10 % 6.5x2.5mm mouser link 6.3x2.4mm mouser link matched to R3 mouser link matched to R2 mouser link matched to R5 mouser link matched to R4 mouser link 20 % tayda link... - Page 15 Part Value Tol. Min.V Dimmensions link type notes olt. Inductors 47uH mouser link filter on XLR 47uH mouser link filter on XLR Tranzistors 2N3819 mouser link alternative BC264, PCB footprint match BC264 pin out BC559C mouser link alternatives: 2N5087, BC560 HFE matched to T3 BC559C mouser link...