一、引言超低频或甚超低频范围的延迟电路,是比较不易解决的。其关键在于充放电回路的元器件受到某些客观条件的限制。场效应管的最突出特性,就是它的输入电阻非常高,一般可达到几百兆欧甚至一万兆欧。用这类场效应管的性能参数设计成一种特殊延迟电路。通过实验测试表明,该电路确实具备结型管不易损坏和绝缘栅型高输入电阻的特性,从而保证了电路能长时间地延迟。 First, the introduction of ultra-low frequency or very low frequency range of the delay circuit is relatively difficult to solve. The key lies in the charging and discharging circuit components subject to certain objective conditions. The most prominent characteristic of the FET, is its input resistance is very high, usually up to hundreds of megaohoo or even 10 megaohoo. With the performance parameters of these FETs designed as a special delay circuit. The experimental results show that the circuit does have the characteristics of not easy to damage the junction tube and the high input resistance of the insulated gate, so as to ensure the circuit can delay for a long time.