TonyStewart‭

Allow me to address the MOSFET only as a source follower. this has very unpredictable linear use without voltage = current feedback as the RdsOn at threshold has a wide tolerance.(>20%) (Many...

posted 4y ago by TonyStewart‭  ·  edited 4y ago by TonyStewart‭

Capacitors are lossless with 0 ESR and rise in temperature and become less reliable by 50% for every 10’C rise due to I^2ESR=Pd losses. However the current spectrum must be known with the ESR frequ...

posted 3y ago by TonyStewart‭  ·  edited 3y ago by TonyStewart‭

This is about as simple an analog inverter that I can simulate, but warning, not for the beginner with resonance issues. The bridge diodes are 2f multipliers reduced to logic level with divide by ...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

How to test a Tunnel diode in 25 words or less. With DC bias = ~490mV with fine tuning and a small signal swing of 60mV you can generate a IV negative slope of -16 Ohms.

posted 4y ago by TonyStewart‭  ·  edited 4y ago by TonyStewart‭

Anti-Aliasing filter depends on the following parameters; Signal BW Sampling Rate Sampling duration and thus BW of sample LPF attenuation of alias spectrum above 1. From your SNR spec or dy...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

DC offsets in hundreds of mV from different grounds may be coming from either the floating ground or the PE earth. The latter may be from rectified AC line filter noise shunted to PE. The former m...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

A resonator cannot replace a filter because the filter has multiple resonances to extend the bandwidth. For AM carrier modulation using a narrow band resonator with 0.5% tolerance of 6MHz or +/-30...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

To understand the timing, you must understand the cause. Delay is the time from input to output It is measured from +10% of input to 90% of output ( or a 10% change in output), unlike logic chips ...

posted 2y ago by TonyStewart‭  ·  edited 2y ago by TonyStewart‭

It is important to realize that an ECG signal is high impedance and this easily picks up line voltage E-fields. Using a 50 Ohm sig.gen. is a poor simulation of the use of this circuit and also neg...

posted 1y ago by TonyStewart‭

I have never seen this slow drift in ceramic caps, yet I have seen fast memory effect drift in S&H designs using high Dk ceramic capacitors in the 70's. So I have learnt that all ceramic caps h...

posted 12mo ago by TonyStewart‭

$$Z = R + jX $$R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hott...

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

gas tubes, SCRs, and welder arcs all have negative incremental resistance. This means when conduction begins, the resistance drops like a crowbar and is sustained until the current drops belo...

posted 1y ago by TonyStewart‭

Possibly it is damaged. Be ESD aware and do not power up with any voltage on any pins > 0.5V (Latchup failure) If raising p9 (reset) does not lower Q to logic "0"=<20% Vdd) replace the ...

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

It is interesting to see how they deposited these carbon electrodes over solder mask and copper traces both under the button foil switches and membrane switches alike which offer more tactile feel....

posted 10mo ago by TonyStewart‭  ·  edited 10mo ago by TonyStewart‭

Every real part has resistance including your piezo current source. Every switch resistance is a loss in energy (I^2 R * t)=E and includes diode and transistor switches. What you need, I think, is...

posted 7mo ago by TonyStewart‭