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Freeform a suspended bicore

This is a fairly simple circuit to make and it shouldn't take you too long with some practice. The purpose of a suspended bicore is for use with heads or anything else that needs a phototropic version of a normal bicore. I would like to point out that even though I've redone all the images and added/subtracted some info the main part of this tutorial should be credited to Ian's BEAM-Online website.

Parts needed:
1 - 74xxx240 IC
2 - .20uf capacitors
2 - photodiodes
And a couple peices of wire/leads that you can cut off of the capacitors.


1. Bend all of the leads on your IC to match the picture shown here. But make sure you are careful when bending because the leads will break off very easily. To reduce chances of breaking the IC you can use an IC holder.











2. Take two pieces of cut off leads from the capacitors and solder them on to the chip like shown. (Leads = white) Make sure you solder everywhere that is touching one of the chips leads.











3A. Now you must use a piece of (shielded) wire and attach it to the places shown in the image. Sheilded wire is recommended because that decreases your chances of shorting the circuit greatly.











3B. This is just another view of step 3












4. Now all you have to do is make your capacitor leads short and solder them onto the IC. Now your ready to setupe the photodioes.












Now that you've completed the basic bicore (minus the normal resistor) your going to have to add the photodiodes. This is very simple. Click here to find out how to make the setup and then keep reading below to find out how to attach it to the circuit.

5. Now all you have to do is attach one lead of the photodiodes to the capacitor lead and the other lead of the photodiodes to the other capacitor lead. (See the three images below to figure out what I mean.)