Thank you Bernard, The first one is not so clear what components go where, can you compliment your drawing with one more that is a little clearer what goes where?

Thank you ...remember i am still a novice ... ;-)

Was making the mechanism today , had to teach this evening so i dint quite have time to put a meter on that OSI i have

 

Something did not look right with the long swing inhibit, finally realized that U4-A was reset on wrong edge of the clock so hopefully it is corrected. Now a 2 input NAND gate could be used, giving 2 spares.
Are you planning to use stripboard ? If so I'll correct the layout.

 

yes i think so ;-)

 

Big dots are strip cuts, except 9-27, C2. Orange lines show resistor, 1/4 W, locations. Green boxes are IC's, U4A on top, pin 1 at 8-10, & 8-22. C3 lead spacing unknown, so allowed .5 in. I don't like parts on top of jumpers but there they are- under R6, add insulation, & FET source to ground- insulate.
Would be a good idea to compare print to board layout.

 

That is much clearer, thank you Bernard
Today continued with the mechanical bit and put my meter across the pins of the sensor the readout in Ohms was between 2.3 and 0.6M , does that sound right?
I am now going to order some 10mm bore bearings for the axil of the pendulum
I will print out all our communications and follow carefully your notes and circuit diagrams

 

If your ohmmeters red lead is +, then the low reading might be the LED, red to anode, black to cathode, but where are the other two leads ? Could you see any sign of color when measuring ?

 

what do you mean sign of colour?

 

4 pins on the OSI two give reading two dont

 

On OSI, two pins give low reading, the + lead is on the LED anode. Connect a resistor of 600 to 700 ohms from anode to + 12V, - to cathode. You see no red light-- good, it probably IR LED. Connect ohmmeter to other pair;
one direction will read almost 0 ohms, reverse direction might read something. With 0 connection, block the slot, reading should go high, + lead is on collector. Pins should fit on stripboard ?

 

Ok this is complicated but i think i understand , i will try with the resistors and 12 v power supply

 

Hi Bernard

Sorry been busy this week doing other stuff. Got the beings through this morning, going to use aluminium hollow square section bars for the pendulum arms


been trying to figure out :

On OSI, two pins give low reading, the + lead is on the LED anode. Connect a resistor of 600 to 700 ohms from anode to + 12V, - to cathode. You see no red light-- good, it probably IR LED. Connect ohmmeter to other pair;

Can you do a little drawing of the polarity with the power and the resistor ?

I have identified the emitter and detector + and -


All the best

Derek

 

Hope this helps. If you have a 5 V supply, could use 300 ohm R & if you guess wrong, might not destroy sensor. Other drawing is possible mounting for OSI's.

 

thank you ;-) What is the G80t?

 

I looked & looked & could not find a G80t, reviewed most recent print & there it was,
680 ohms +_ .

 

I am totally lost ... i dont know what a G80t is , a resistor ? variable resister. I dont have a 5v supply 6v maybe or 4.5.

Maybe this project is too difficult for me.
I haven't started making yet because i have been busy teaching and waiting for the bearings. i have time to tomorrow to make experiment.

 

The thing that looks like G 80 t is a resistor of 680 ohms or 620 to 750. Maybe my vision was off a bit as I had cataract surgery on rt. eye yesterday morning.
If power supply is 6 V try 320 ohms, if 4.5 try 220 ohms.
There is a good chance that your RSI's have the same printout as Cricklewood RA138.
Hang in there, it's only 2 IC's & RSI's.

 

Ok i will try and carefully work my way through. I hope your surgery went well and you now will see better.

 

Hi Bernard,

I Am unable to work on this project the past couple of weeks due to me waiting to be relocated to a new studio which means I will have to put the circuit on hold for now. I will get back to you when I am up and running which I hope you are. They are looking to June for the relocation, so crossed fingers there.
Until then all the best

Derek

 

We're still around. Second eye is done, now just reading glasses.

 

Good, I am glad the op went well for you Bernard. Be back to you in good time ;-) Thanks