You may be very lucky here, everything could just work.?
The transistors are all protected by a diode or resistor or both.
I suggest you just put everything back together and see if the receiver works.
If it does not work, try following the procedure Farhan outlines here: ??
(His piece of wire has nothing on the other end, it is just an antenna to pick up local QRM)
Forget D7 ever existed.
D7 doesn't really do anything at all due to a mis-wire in the schematic (the PC board follows the schematic).
It is supposed to be across relay K1, just like D8 it scross K2.
The diode D7 would give the reverse EMF of the K1 coil someplace to go when the PTT switch opens up.
Without D7 properly installed, there may be arcing across the PTT switch, with some impact on reliability.
Plus spikes on the main 12v rails into the radio.
But that is not your main concern. ?
Just know that D7 never did much of anything for anybody because it was wired up wrong.
On mine, the entire radio takes 150ma from my 12v supply to receive.
If I unplug the Raduino, the main Bitx40 board takes 73ma.?
Raj's advice to check the base-emitter voltage across all those NPN transistors is a good one,
just unplug the Raduino and look for around 0.7 volts on each NPN with a DC voltmeter.
Also check to see if U2 pin 1 has 9 volts.
When you get around to checking the transmitter, U3 pin 1 should have 5 volts when PTT is pressed.
If you get stuck, try finding somebody with a scope.
Jerry
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On Sun, Jun 11, 2017 at 01:00 pm, <mattcarus@...> wrote:
It is certainly possible that I reversed the supply leads - all of the other wiring looks ok but I might have simply put the spade connectors on the wrong way round. I used the battery because it's what was to hand but good point about monitoring the voltage on transmit.
?
