0
\$\begingroup\$

circuit

  • Transistor 2n3904
  • Homemade transformer with 10 turns
  • Power supply 1.5 v

Schematic:

enter image description here

I think the toroid winding shorts the power supply as it happens with my buck converter.

I think the toroid winding shorts the power supply as it happens with my buck converter.My multimeter shows the positive input and ground shorted,two of transformer are shorted and those are shorted with other outputs of transformer and one of them is connected to the ground

\$\endgroup\$

closed as unclear what you're asking by Voltage Spike, Dave Tweed Jun 10 at 23:50

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ can't tell which LED lead is which from your photo. \$\endgroup\$ – Scott Seidman Jun 10 at 16:12
  • 1
    \$\begingroup\$ what does it do/ not do? Where's your power sourcer attached? This is impossible to answer as is – aside from the solder joints looking extremely bad, we simply can't tell how your transistor and LED are connected. You have to draw a circuit schematic using the built-in schematic tool of this website's question editor to clarify what you're dooing. \$\endgroup\$ – Marcus Müller Jun 10 at 16:13
  • \$\begingroup\$ Joule Thieves tend to rob power and kill batteries. Winding polarity is critical as well and turns ratio for base to collector load. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jun 10 at 16:24
  • \$\begingroup\$ well i am powering it by 1.5v cell or a buck converter \$\endgroup\$ – Jyotir Jun 10 at 16:24
  • 2
    \$\begingroup\$ Your emitter is missing a battery connection. \$\endgroup\$ – Scott Seidman Jun 10 at 16:34
1
\$\begingroup\$

I think the toroid winding shorts the power supply as it happens with my buck converter.

The toroid should not be connected so that it shorts the power supply. If the red and black wires are going to the battery, then you've wired it wrong. What you have in the photo doesn't match the circuit diagram.

I can only guess as to which lead from the transistor is which, but there should be no point where any wire from the toroid connects to the battery negative lead.

\$\endgroup\$
  • 1
    \$\begingroup\$ It looks a lot like the battery negative is connected to the transistor collector, instead of the emitter. \$\endgroup\$ – David Jun 10 at 21:44

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