1
\$\begingroup\$

This is my Slayer Exciter circuit

In my Slayer Exciter circuit, the current from the battery flows into the primary coil (with four turns) and therefore, a current is induced in the opposite direction in my secondary coil. This current flows into the wire coming from the base of the transistor and opposes the current flowing through the 22k resistor. Is there a specific name for this?

\$\endgroup\$
2
  • \$\begingroup\$ What's connected above the secondary coil? \$\endgroup\$
    – Sven B
    Feb 4 '18 at 10:44
  • \$\begingroup\$ Current in one coil induces a voltage in another coil. Current isn't induced but it may flow due to the induced voltage and a connected load. \$\endgroup\$
    – Andy aka
    Feb 5 '18 at 11:42
1
\$\begingroup\$

Secondary feedback.

Without it there's no oscillation - the circuit will find a steady state where constant current flows through the coil. By affecting the primary switch by the voltage on the secondary coil, you provide a self-sustaining oscillation - off state causes on state and on state causes off state.

\$\endgroup\$
2
  • \$\begingroup\$ Heath Raftery is completely right. \$\endgroup\$ Jan 6 '20 at 16:09
  • \$\begingroup\$ @DavideTannerTaini There is a button you can click when you think someone is completely right. \$\endgroup\$
    – user253751
    Feb 10 '20 at 15:40
1
\$\begingroup\$

The configuration is a type of blocking oscillator. Compare the circuit with the original US Patent 221,852 (image below from the patent):

enter image description here

The triode (vacuum tube) is 'on' with zero gate-to-cathode voltage so it does not need the bias resistor to turn it on. There is a hidden current path from the high voltage end of the secondary to ground in your circuit (through arcing or corona discharge).

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.