Testing Now Underway

Testing is now in progress.  After checking for any low resistances with the ohm meter no problems were found.  I then attached the battery and measured the current which was 800 mA which according to G0OKD was well within parameters. 

I then checked the voltages across R6 and R2 which were showing voltage drops which gain indicated the circuit was drawing current correctly.  On applying my new high tech audio probe  (.75mm steel crochet hook) to pin 2 of IC2 LM368 audio amplifier an very loud hum was heard through the speakers inducing that all is well with the af amplifier. 

The next stage will be to check the output for the NE612 mixer IC. 

All My Own Work

The End Is In Sight

Slowly over the week. sadly work gets in the way, the final parts have been soldered, wire to gain control, tuning capacitor etc all in place.  All it needs now is a final checking over for solder bridge and dry joints and it will be ready for testing.

Fingers crossed. 

Oops

Yes ,I have realised have  transposed L3 and L1.  I am now de-soldering and re positioning. . 

All capacitors now fitted.  Played hunt the capacitor for the one that went missing off the polystyrene board.  It would be the tiny one wouldn't it.  

Tweezers now located finger burns reduced. 

Capacitors lined up and ready for installation tomorrow.   So far the project is going well and board is very easy to solder.

Notice the eye glass for checking for bridges and dry joints.  I am getting old and the eye sight is going.   

A hour at a time is quite sufficient for me.  Therefore this could be a long project.  

Next stage photo - resistors in place and blood wiped off board.

 

Today the IC Holder tomorrow the world

The soldering iron was retrieved from the loft a little behind schedule.  The IC holders. coils and resistors are now on the board all carefully checked by my assistant and photographer G0OKD.  Just a few minor burns when holding in the resistors.   Now where did I put that set of tweezers!!!

Photograph of IC holders and coils in place.