transistors 55 and 56 are connected to ground either of the above configurations shown in fig2 and 3 can be further modified for example as shown in fig4 by connecting the cathode 772 of zener diode 77 to the cathode 752 of diode 75 and connecting the anode 771 of zener diode 77 to out low 4 this modification will allow for the gain of oscillation voltage as the collapsing field of transformer 1 or 2 causes the current to flow at the same rate as the inducted current thereby producing a voltage equal to the product of the transformer current and the primary and secondary load resistance operationally using the configuration depicted in fig2 as an example when the output 513 of nand gate 51 is high transistor 55 will be turned on by the signal to its base 551 at the same time nand gate 52 will invert the output of 51 providing a low signal to the base 561 of transistor 56 causing transistor 56 to be off the output 513 of nand gate 51 is fed back into its inputs 511 and 512 through resistor 61 to charge capacitor 58 this causes the state of output 513 to oscillate at a period calculated from the time constant of the charging circuit resistor 61 capacitor 58 and nand gate 51 when capacitor 58 charges to a voltage sufficient to reach a logical high on inputs 511 and 512 nand gate 51 changes state to produce a logical low on output 513 capacitor 58 discharges through resistor 61 and.