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Add Amp 0619 5286
A two channel wireless mic receiver used at my church. One microphone has died, to be investigated one day... The audio levels out of the receivers have always been low.
I have added a one stage one transistor amplifier to the signal just before the level control of the still-working mic's receiver. The stage gain was adjusted and set using a fixed unbypassed emitter resistor. The load resistor was selected to suit the level control value fed from the new stage.
Pip 1 shows the relevant level control removed during feasibility investigation.
Pip 2 shows the circuit during development and test. The BC548 transistor is held in a vice and all the components hanging off it. Power during testing came from an AT computer power supply.
Pip 3 shows the circuit being transferred to a piece of insulated board for mounting in the receiver box.
Pip 4 shows power for the installed amplifier being obtained from the receiver's 9V regulator. Earth and negative supply was soldered to the main circuit board adjacent to the mounting location.
Pip 5 shows the amplifier board temporarily mounted with all wires connected. It works as intended and I now need to replace the mounting tape with screws and standoffs.
I have added a one stage one transistor amplifier to the signal just before the level control of the still-working mic's receiver. The stage gain was adjusted and set using a fixed unbypassed emitter resistor. The load resistor was selected to suit the level control value fed from the new stage.
Pip 1 shows the relevant level control removed during feasibility investigation.
Pip 2 shows the circuit during development and test. The BC548 transistor is held in a vice and all the components hanging off it. Power during testing came from an AT computer power supply.
Pip 3 shows the circuit being transferred to a piece of insulated board for mounting in the receiver box.
Pip 4 shows power for the installed amplifier being obtained from the receiver's 9V regulator. Earth and negative supply was soldered to the main circuit board adjacent to the mounting location.
Pip 5 shows the amplifier board temporarily mounted with all wires connected. It works as intended and I now need to replace the mounting tape with screws and standoffs.
k m 7 d, Frans Schols, Aus Blue have particularly liked this photo
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GrahamH club has replied to Aus BlueAus Blue has replied to GrahamH clubZeer interessant dat jij nog altijd reparaties doet aan de elektronica!
Hartelijke groeten..........Frans.
Regards Peter
GrahamH club has replied to Peter Chet clubSign-in to write a comment.