10V High-Stability Voltage Source Model

High-stability voltage source

Fig .1 Highly stable source of voltage schematic

Experimental studies of exemplary scheme of a highly stable source of voltage (Fig. 1) in the temperature range from -18 ° C to 50 ° C show that the temperature error of less than ± 0.001% / ° C, temporal drift no more than ± 0.005% per day. Source has a small thermal hysteresis (Fig. 2).

Fig. 2 temperature characteristic of source

Parts list :

R1, R3 =1K
R2 = 15K
R4 = 6K8
R5 = 2K2
R6,R10 = 110 ohm
R7 = 11 ohm
R8 = 820 ohm
R9 = 3K3
C1,C2 = 10nF
D1 = D818E

To ensure high stability in the scheme used the method of heating the crystal heating and temperature monitoring. To study the selected type of transistor assembly 1NT251 with Formula. Transistor Q2 is used to heat the crystal, and Q4 – a temperature sensor. Zener diode D1 – D818E. The operating mode is set for not more than 1 minute.

psu