nº849

Lithium ion battery charge(4,20V)/discharge(3V) protection with 2 bipolar transistors. Supply >=5V.

nº848

The ferrite bead led torch with 8 white leds, supply 1xNiMH. Low component count.

nº847

Inverter and non-inverter logarithmic amplifier.

nº846

- Simple toroid "joules thief"for violet led.
- "Ladrão de joules" simples por toroide para led violeta.

nº845

Dummy load for wireless near field (inductive coupling) power receiver.

nº844

Sample of simple joules thief with ferrite bead.

nº843

Simple timer; Toff=15min-24h; Ton=15min-24h. The binary counter switches between NE556 astable multivibrators every 8192th clock negative transition.