Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Modifying KL-40 for higher input
I am looking for a way to modify an RM KL-40 to accept higher input. Please
look at http://www.rmitaly.com/rm/download/m...al_rel_400.pdf for the schematic. I can put a voltage divider where R2 and R3 are but I have one concern. This would put a resistor in parallel (to DC) with R1, which is between the gate of the MOSFET and ground. Will this affect the circuit? Thanks, Chris |
#2
|
|||
|
|||
I can put a voltage divider where R2 and R3 are but I
have one concern. This would put a resistor in parallel (to DC) with R1, which is between the gate of the MOSFET and ground. Will this affect the circuit? Chris- Yes, it would appear to upset the bias on the MSFT1 gate. R4 is in series with R2//R3 and R1. Current flowing through R1 develops a DC bias voltage on the gate. You should be able to DC-isolate a new shunt resistor by wiring a capacitor in series with it. Try and keep added components away from the output side of the circuit, or it could turn into an oscillator! 73, Fred, K4DII |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
[OT] Rcvr antenna input impedance | Antenna | |||
NEW PROGRAM - Input Impedance & SWR of resonant antenna | Equipment | |||
d.c. input spec for icom 735 | Equipment | |||
Interfacing current driven differential output to voltage driven differential input | Homebrew | |||
Interfacing current driven differential output to voltage driven differential input | Homebrew |