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Bulgarian 'PULSE STAR' (... close to Legendary one)
The launch of this circuit was difficult. Normally without any voice coil circuit is slightly wet fingers, but when I Asylatvr transistors 555 and alarm system to Mykshm.
When the coil 20 cm can be connected to the metal detector q4 is extremely hot and burns. Profile coils is this way: 32 round wire diameter of 0.50 to 20 cm.
I'll guess that the problem is the coil.
Metal detectors instead of the 2n2646 transistor ujt I use. I want to know that this device provides a problem? Base sequence in this transistor pcb do not know Please help me.
Tl072 use instead of my 1458. This problem does not and I do I replace them?
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