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Voltage-to–frequency converter on logical gates

Voltage-to–frequency converter on logical gates

Voltage-to–frequency converter on transistors generates TTL output impulses in a range from 0 to 50 kGz at input voltage from 0 to 10 V (fig.1). The transistors Q1 and Q2 has an amplification factor by current no less than 100, Q3 – KT117, Q4 – any type of n-p-n. The resistor R4 is set the frequency Fout = 0 Hz at Uinp = 0 V. And the resistor R5 is set the frequency Fout = 50 kGts at Uinp = 10 V.

Fig. 1. Voltage-to–frequency converter on transistors.

Voltage-to–frequency converter on AND gates are pointed on fig.2. Circuits are practically linear in the range of input voltage from 0 to 1.2 V. Frequency of input signal relies on the basic values of the resistors R and condensers C.

Fig. 2. Voltage-to–frequency converter on logical gates.

added 17.01.09 00:09:51 | looked over 4086 times